AU2020102720A4 - Remediation device and method for soil and groundwater polluted by chlorobenzene organic matters - Google Patents
Remediation device and method for soil and groundwater polluted by chlorobenzene organic matters Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 47
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000003673 groundwater Substances 0.000 title claims abstract description 24
- 238000005067 remediation Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 239000000523 sample Substances 0.000 claims abstract description 23
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 12
- 231100000719 pollutant Toxicity 0.000 claims abstract description 12
- 239000000243 solution Substances 0.000 claims description 52
- 238000003860 storage Methods 0.000 claims description 40
- 239000002585 base Substances 0.000 claims description 29
- 230000002572 peristaltic effect Effects 0.000 claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 20
- 239000002253 acid Substances 0.000 claims description 17
- 239000003513 alkali Substances 0.000 claims description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 230000008439 repair process Effects 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 claims description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 4
- 235000011152 sodium sulphate Nutrition 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000033116 oxidation-reduction process Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000005520 electrodynamics Effects 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- -1 Chlorobenzene organic compounds Chemical class 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- 101150071746 Pbsn gene Proteins 0.000 description 2
- 229920005372 Plexiglas® Polymers 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000009393 electroremediation Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 210000003169 central nervous system Anatomy 0.000 description 1
- 150000008422 chlorobenzenes Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005370 electroosmosis Methods 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 210000004877 mucosa Anatomy 0.000 description 1
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- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
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- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 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
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A device and a method for repairing soil and groundwater polluted by chlorobenzene organic
matters belong to the technical field of environmental protection. Concentric electrodes are
installed in contaminated sites, electrodes are inserted in electrode chambers, and PRB
reaction walls are installed at 1/2 between anode and cathode and 1/4 away from anode. The
arrangement of the electrode area enables chlorobenzene in soil or groundwater to be
enriched in the PRB area, and then chlorobenzene is removed by the oxidation-reduction
action of the PRB. According to the invention, the electrode liquid can be automatically
updated and recycled, and the economic cost is reduced; Reduce the demand for personnel;
Operation becomes simple; Completely treat the pollutants in the polluted area; Accelerate
the speed of soil remediation. The method greatly improves the treatment effect of
chlorobenzene organic matters in soil and groundwater; By introducing pH probe and
automatic control device, the treatment process is more automatic.
-1/2
101071 7 105
5
6-2 6-1 6-1 6-2
4-3 4-2 4-1 4-2 4-3
23 3-4 3-3 - 2-2 3 \3- 2-1 3- 2 3-4 -3
Figure 1
Description
-1/2
101071 7 105
5
6-2 6-1 6-1 6-2
4-3 4-2 4-1 4-2 4-3
23 3-4 3-3 - 2-2 3 \3- 2-1 3- 2 3-4 -3
Figure 1
PATENTS ACT 1990
Remediation device and method for soil and groundwater polluted by chlorobenzene organic matters
The invention is described in the following statement:-
Remediation device and method for soil and groundwater polluted by chlorobenzene organic matters
The invention relates to an EK-PRB (Electrokinetic-Permeable Reaction Barrier) remediation device and method for soil and underground water polluted by chlorobenzene organic substances, belonging to the technical field of environmental protection.
With the rapid development of global industrialization, harmful heavy metals and organic pollutants enter the soil through various channels, causing pollution to the soil. Soil pollution not only affects agriculture, but also harms groundwater pollution and human health. Therefore, soil remediation is an urgent technology. Chlorobenzenes,CBs), which have stable physical and chemical properties and are not easy to be chemically hydrolyzed and biodegraded in soil, are widely found as hydrophobic chlorinated organic pollutants in the environment. Chlorobenzene organic compounds can irritate human skin and mucosa, inhibit and anesthetize central nervous system, and lead to human poisoning and endanger human health; Moreover, these organic substances have been deposited in the soil for a long time, causing serious organic pollution to the soil and water environment. Therefore, it is very important to study the residue and degradation of chlorobenzene in soil. There are many remediation technologies for chlorobenzene organic compounds at home and abroad, but none of them has universal applicability.
PRB repair technology is an in-situ passive repair technology. Its basic principle is to establish a permeable reaction zone along or perpendicular to the water flow direction, which is filled with active materials (such as zero-valent iron, activated carbon, etc.). When the water flow passes through PRB(Permeable Reactive Barrier Permeable Reaction Wall) under the action of its own hydraulic gradient, the pollutants are removed by chemical reaction with wall materials, thus achieving the purpose of environmental restoration. Once the PRB is installed, there is almost no need for other operation and maintenance costs, except for the replacement of wall reaction materials in some cases. Therefore, it is a technology with low consumption and long-term use. The main principle of electrokinetic remediation technology is to apply DC voltage to both ends of contaminated soil to form an electric field gradient, so that pollutants in the soil can be migrated to both ends of electrodes by electromigration, electroosmotic flow and electrophoresis under the action of electric field, thus cleaning the soil and achieving the purpose of removing pollution. It mainly targets inorganic pollutants (such as heavy metals such as lead, cadmium, chromium and zinc), polar and nonpolar organic pollutants (such as benzene, toluene and xylene) and radioactive substances. This technology has the characteristics of high efficiency and cleanness, and the treatment depth can reach 10 ~ 20 meters, which has wide applicability.
Because of the differences in soil composition, pollutant types and properties, especially
in the case of multiple pollutions, it is often difficult for a single remediation technology
to achieve the ultimate remediation goal. In the electro-dynamic repair technology, a
large amount of H and OH are produced at the cathode and anode respectively during
the electrochemical reaction. Without any external restrictions and measures, these ions
will move to the cathode and anode respectively through migration, seepage and diffusion
under the action of electric field, until they meet and neutralize, and a pH mutation will
occur at the neutralization place. From this point, the whole operation interval will be
divided into acidic region and alkaline region. Therefore, how to control pH value has
become the focus of electrokinetic repair. However, PRB technology also has some
limitations. First, with the continuous deposition of organic matter on the permeable
reaction wall, the passive treatment will lose its activity, so the equipment must be
replaced regularly; At present, the research on PRB is still insufficient, and the best
method for the treatment of multi-component and multi-item organic matter cannot be
found. EK-PRB joint remediation technology is a new, green and environmental
protection remediation technology, which mainly combines Electrokinetic Remediation
technology with Permeable Reactive Barriers,PRB) technology to jointly remediate contaminated soil, and makes organic substances with high toxicity move to the electrode end by electrokinetic force, so that the pollutants react with the filling materials in the permeable reactive barriers.Degradation into low-priced metal ions and organic substances with low toxicity can not only remove pollutants but also achieve the purpose of reducing toxicity. EK-PRB combined technology combines the advantages of two remediation technologies, which belongs to in-situ remediation, not only can repair heavy metal pollution, but also can repair organic pollution, such as chlorobenzene organic matter; Moreover, the combined technology is less affected by external factors, which avoids adding environmentally unfriendly substances to the soil, and the repair cost is much lower than other methods. The domestic research on EK-PRB combination technology is still mainly in the laboratory scale, which is not mature. Therefore, an effective EK-PRB remediation technology is urgently needed for groundwater and soil polluted by chlorobenzene.
To solve the above problems, the present invention provides an EK-PRB remediation device and method for soil and groundwater polluted by chlorobenzene organic matters. The device and method can be used for in-situ remediation of contaminated soil and groundwater, and can adjust PRB adsorption materials according to different actual pollutants, and adjust the distance between concentric circles according to site conditions. An EK-PRB soil and groundwater remediation device has the following structure:
As Figure 1 and Figure 2 illustrating, a direct current power supply (1) is connected with a first electrode (4-1), a second electrode (4-2) and a third electrode (4-3) through wires, wherein the first electrode (4-1) at the center of the circle and the outermost third electrode (4-3) are anodes and are connected with the anode of the direct current power supply (1). The first electrode (4-1), the second electrode (4-2) and the third electrode (4-
3) are respectively installed in the first electrode chamber (2-1), the second electrode chamber (2-2) and the third electrode chamber (2-3);The electrode liquid storage tank (8) and the electrode liquid treatment tank (9) are respectively connected with the automatic control device (7) through pipelines, and the electrode liquid storage tank (8) is connected with the electrode liquid treatment tank (9) through pipelines and a single-channel peristaltic pump (11); Each electrode chamber is provided with a pH probe (5) which is connected with an automatic control device (7) which is connected with a multichannel peristaltic pump (10), and the multichannel peristaltic pump (10) is respectively connected with the first electrode chamber (2-1), the second electrode chamber (2-2) and the third electrode chamber (2-3); A first PRB reaction wall (3-1) and a second PRB reaction wall (3-2) are installed between the first electrode chamber (2-1) and the second electrode chamber (2-2), at 1/4 and 1/2 of the direction close to the first electrode chamber (2-1) A pH probe (5), a first acid-base regulating liquid inlet pipe (6-1) and a second acid-base regulating liquid inlet pipe (6-2) are respectively arranged between the first PRB reaction wall (3-1) and the second PRB reaction wall (3-3) and the fourth PRB reaction wall (3-4) The pH probe (5) is connected with an automatic control device (7), which is respectively connected with an acid liquor storage tank (12) and an alkali liquor storage tank (13) through pipelines, and then connected with a first acid-base regulating liquid inlet pipe (6-1) and a second acid-base regulating liquid inlet pipe (6-2) through a multichannel peristaltic pump (10)
The method for repairing the polluted area by using the EK-PRB soil and groundwater repairing device comprises the following specific steps:
1) Examining the overall layout of the land characteristic determination device in the polluted area, determining the scope and conductivity of the polluted area, comprehensively considering the distance between concentric circles, and ensuring the coverage of all polluted areas to be treated; 2) The first electrode chamber (2-1) and the first electrode (4-1) are installed in the most polluted area, and other electrode chambers and electrodes are arranged in concentric circles;
3) According to the determined electrode areas, two sets of PRB reaction walls are arranged between the two electrode areas: 1/2 between the anode and the cathode and 1/4 away from the anode to meet the needs of treating pollutants in groundwater and soil at the same time; 4) The electrode solution is prepared and added into an electrode solution storage tank (8), and corresponding acid-base solutions are added into an acid solution storage tank (12) and an alkali solution storage tank (13), and the prepared electrode solution is pre loaded into an electrode chamber. The device selects a mixed solution of sodium sulfate and sodium carbonate as the electrode solution with a concentration of 0.025mol/L, the acid solution is 5% HCl solution, and the alkali solution is 1% NaOH solution; ) A PH probe (5) is arranged in the polluted area, and a first acid-base adjusting liquid inlet pipe (6-1) and a second acid-base adjusting liquid inlet pipe (6-2) with holes are evenly arranged between two sets of PRBs to adjust the pH value of the PRB area and keep the pH value of the electrode soil between 7 and 10. When the pH value is too small, it is communicated with an alkali liquor storage tank (13) through an automatic control device to neutralize to a suitable pH range. 6) The pH probe (5) in the electrode chamber is used to test the pH of the electrode solution to check whether the electrode solution is saturated or not. It is connected with the automatic control device (7), which pumps out the saturated electrode solution and injects it into the electrode solution treatment pool (9), and then injects new electrolyte. After being mixed, the electrode solution recovered by the anode and cathode can be transported to the electrode solution storage tank (8) again as electrolyte by the single channel peristaltic pump (11). 7) CBs of polluted areas can be carried out by using the EK-PRB soil and groundwater remediation device equipped above. The arrangement of electrode area makes chlorobenzene in soil or groundwater enrich in PRB area, and then chlorobenzene is removed by oxidation and reduction of PRB. The invention has the beneficial effects that:
1. the electrode solution is automatically updated by the pH probe measurement and automatic control device, and the electrode solution in the cathode and anode chambers can be recycled after simple treatment, thus reducing the economic cost; 2. The pH probe and automatic control device are used together, which greatly enhances the automation degree of the device, reduces the demand of personnel, and makes the operation simple; 3. The concentric circle electrode arrangement includes all the polluted areas, and the distance between concentric circles can be adjusted according to the local actual situation to completely treat the pollutants in the polluted areas; 4. The combination of electrodynamic and PRB technology is that the device can treat organic pollutants in soil and groundwater in situ at the same time, and can also accelerate the speed of soil remediation.
Fig. 1 is a schematic diagram of the apparatus of the present invention. Among them, (1) is DC power supply; (2-1) and (2-3) are anode chambers; (2-2) is a cathode chamber; (3 1), (3-2), (3-3) and (3-4) are PRB reaction walls; (4-1) and (4-3) are anode electrodes; (4 2) is the cathode electrode; (5) It is a pH probe; (6-1) and (6-2) are the inlet pipes of acid base regulating liquid; (7) It is an automatic control device; (8) It is an electrode liquid storage tank; (9) It is an electrode solution treatment pool; (10) is a multichannel peristaltic pump; (11) is a single-channel peristaltic pump; (12) is an acid storage tank; (13) is an alkali liquor storage tank.
Fig. 2 is a schematic plan view of the present invention. Among them, (2-1) and (2-3) are anode chambers; (2-2) is a cathode chamber; (3-1), (3-2), (3-3) and (3-4) are PRB reaction walls; (6-1) and (6-2) are inlet pipes of acid-base regulating liquid.
The present invention will be further explained with reference to the drawings and specific embodiments.
The remediation device for soil and groundwater polluted by chlorobenzene organic matters is shown in Figure 1, The repair device comprises a direct current power supply (1), a first electrode (4-1), a second electrode (4-2), a third electrode (4-3), a first electrode chamber (2-1), a third electrode chamber (2-3), a second electrode chamber (2 2) and an electrode liquid storage tank (8), An electrode solution treatment pool (9), an automatic control device (7), a single-channel peristaltic pump (11) and a pH probe (5), a multichannel peristaltic pump (10), a first PRB reaction wall (3-1), a second PRB reaction wall (3-2) and a third PRB reaction wall (3-3),a fourth PRB reaction wall (3-4), a first acid-base regulating liquid inlet pipe (6-1), a second acid-base regulating liquid inlet pipe (6-2), an acid liquor storage tank (12) and an alkali liquor storage tank (13);
A direct current power supply (1) is connected with a first electrode (4-1), a second electrode (4-2) and a third electrode (4-3) through wires, The first electrode (4-1) at the center of the circle and the third electrode (4-3) at the outermost layer are anodes, which are connected with the anode of the DC power supply (1).The cathode of that second electrode (4-2) is connecte with the cathode of the DC power supply (1); The first electrode (4-1), the second electrode (4-2) and the third electrode (4-3) are respectively installed in the first electrode chamber (2-1), the second electrode chamber (2-2) and the third electrode chamber (2-3); The electrode liquid storage tank (8) and the electrode liquid treatment tank (9) are respectively connected with the automatic control device (7) through pipelines, and the electrode liquid storage tank (8) is connected with the electrode liquid treatment tank (9) through pipelines and a single-channel peristaltic pump (11), Each electrode chamber is provided with a pH probe (5) which is connected with an automatic control device (7) which is connected with a multichannel peristaltic pump (10), and the multichannel peristaltic pump (10) is respectively connected with the first electrode chamber (2-1), the second electrode chamber (2-2) and the third electrode chamber (2-2); A first PRB reaction wall (3-1) and a second PRB reaction wall (3-2) are installed between the first electrode chamber (2-1) and the second electrode chamber (2 2), at 1/4 and 1/2 of the direction close to the first electrode chamber (2-1); A third PRB reaction wall (3-3) and a fourth PRB reaction wall (3-4) are installed near the 1/2 and 1/4 of the third electrode chamber (2-3); Between the first PRB reaction wall (3-1) and the second PRB reaction wall (3-2),A pH probe 5, a first acid-base regulating liquid inlet pipe (6-1) and a second acid-base regulating liquid inlet pipe (6-2) are respectively arranged between the third PRB reaction wall (3-3) and the fourth PRB reaction wall (3
4);
The pH probe (5) is connected with an automatic control device (7), which is respectively connected with an acid liquor storage tank (12) and an alkali liquor storage tank (13) through pipelines, and then connected with a first acid-base regulating liquid inlet pipe (6-1) and a second acid-base regulating liquid inlet pipe (6-2) through a multichannel peristaltic pump (10).
The invention relates to a method for repairing polluted areas by utilizing the remediation device for soil and groundwater polluted by chlorobenzene organic matters, which comprises the following steps:
1) Examining the overall layout of the land characteristic determination device in the polluted area, determining the scope and conductivity of the polluted area, comprehensively considering the distance between concentric circles, and ensuring the coverage of all polluted areas to be treated;
2) The first electrode chamber (2-1) and the first electrode (4-1) are installed in the most polluted area, and other electrode chambers and electrodes are arranged in concentric circles;
3) According to the determined electrode areas, two sets of PRB reaction walls are arranged between the two electrode areas: 1/2 between the anode and the cathode and 1/4 away from the anode to meet the needs of simultaneously treating pollutants in groundwater and soil;
4) The electrode solution is prepared and added into the electrode solution storage tank (8), and the corresponding acid and alkali solutions are added into the acid and alkali solution storage tanks (12) and (13), and the prepared electrode solution is pre-loaded into the electrode chamber. The device selects the mixed solution of sodium sulfate and sodium carbonate as the electrode solution with a concentration of 0.025mol/L, the acid solution is 5% HCl solution, and the alkali solution is 1% NaOH solution;
) PH probes (5) are arranged in the polluted area, and perforated acid-base regulating liquid inlet pipes (6) are evenly arranged between the two sets of PRBs to adjust the pH value of the PRB area and keep the pH value of the electrode soil between 7 and 10. When the pH value is too small, it is communicated with the alkali liquor storage tank (13) through an automatic control device to neutralize to a suitable pH range, otherwise, it is communicated with the acid liquor storage tank (12).
6) The pH probe (5) in the electrode chamber is used to test the pH of the electrode solution to check whether the electrode solution is saturated. It is connected with the automatic control device (7), which pumps out the saturated electrode solution and injects it into the electrode solution treatment pool (9), and then injects new electrolyte. After being mixed, the electrode solution recovered from the anode and cathode can be transported to the electrode solution storage tank (8) as electrolyte with a single-channel peristaltic pump (11) after treatment.
If the polluted area is large, increase the number of electrode chambers, but ensure that the innermost and outermost layers are anodes.
Embodiment:
Step 1: make an electric power device
According to the related research at home and abroad, the electro-dynamic repair device is made, including power supply, electrode chamber and electrode.
Step 2: Prepare soil samples
Take 0 - 20 cm topsoil, air-dry, and sieve with 0.25mm copper mesh to remove gravel and plant residues. Prepare soil samples with chlorobenzene concentration of1000mg/kg for later use.
Step 3: Prepare drugs
The mixed solution of sodium sulfate and sodium carboNate with na ion concentration of 0.025mol/L was used as electrode solution. Acid-base adjusting solutions are 5% HCl solution and 1% NaOH solution respectively.
Step 4: PRB reaction wall
The PRB reaction wall is an internal adsorption material. The mass ratio of activated carbon to scrap iron is 2:7, and the size of the reaction wall is 5cmx80cm(WxH).
Step 5: Assemble the device
Fill the prepared soil into a 1m plexiglass cylinder with a depth of <2 m, and tamp the soil once every 5cm. There are water tanks on both sides of the plexiglass cylinder, and the groundwater flow is simulated manually by peristaltic pump, keeping the inlet water level at 50cm and the outlet water level at 49cm. An anode electrode is arranged at the center of the circle, a cathode electrode is arranged at 1m, and a circle of anode electrodes is arranged at the outermost periphery. Set PRB reaction walls 0.25m, 0.5m, 1.5m and 1.75m away from the center point.
Step 6: Device operation
The electric field intensity is 1V/cm with1OOV direct current. The electrode chamber and the electrode liquid storage tank are filled with electrode liquid. The electrode liquid storage tank is provided with an automatic control device and a single-channel peristaltic pump, and newly generated electrode liquid is replenished from the electrode liquid reaction tank in time, so that the electrode liquid can be recycled. The acid-base regulating liquid inlet pipe is connected with acid and alkali liquor storage tanks. A first acid-base adjusting liquid inlet pipe 6-1 and a second acid-base adjusting liquid inlet pipe 6-2 are installed between adjacent PRB reaction walls. The pH parameters are collected by the pH probe installed between the electrode area and the PRB reaction wall, and then controlled by the automatic control device and the multi-channel peristaltic pump to achieve the automatic control of the system. The removal rate reached 84.3% after1Oh treatment by EK-PRB technology, and reached 99% after 5h treatment.
The arrangement of the electrode area enables chlorobenzene in soil or groundwater to be enriched in the PRB area, and then chlorobenzene is removed by the oxidation-reduction action of the PRB. According to the invention, the electrode liquid can be automatically updated and recycled, and the economic cost is reduced; Enhance the automation degree of the device, reduce the demand of personnel, and make the operation simple; Completely treat the pollutants in the polluted area; It can also accelerate the speed of soil remediation.
The method greatly improves the treatment effect of chlorobenzene organic matters in soil and groundwater; Through the installation of the electrode solution treatment pool, the electrode solution can be recycled and the economic benefit is increased; By introducing pH probe and automatic control device, the treatment process is more automatic.
Claims (6)
1. A remediation device for soil and groundwater polluted by chlorobenzene organic matters is characterized by comprising a direct current power supply (1), a first electrode (4-1), a second electrode (4-2), a third electrode (4-3) and a first electrode chamber (2-1), a second electrode chamber (2-2), a third electrode chamber (2-3), a pH probe (5), an automatic control device (7), an electrode solution storage tank (8), an electrode solution treatment pool (9), a multi-channel peristaltic pump (10), a single-channel peristaltic pump (11), a first PRB reaction wall (3-1), and a plurality of electrodes A fourth PRB reaction wall (3-4), a first acid-base regulating liquid inlet pipe (6-1), a second acid-base regulating liquid inlet pipe (6-2), an acid liquor storage tank (12) and an alkali liquor storage tank (13).
A direct current power supply (1) is connected with a first electrode (4-1), a second electrode (4-2) and a third electrode (4-3) through wires, wherein the first electrode (4-1) at the center of the circle and the outermost third electrode (4-3) are anodes and are connected with the anode of the direct current power supply (1). The first electrode (4-1), the second electrode (4-2) and the third electrode (4-3) are respectively installed in the first electrode chamber (2-1), the second electrode chamber (2-2) and the third electrode chamber (2-3);The electrode liquid storage tank (8) and the electrode liquid treatment tank (9) are respectively connected with the automatic control device (7) through pipelines, and the electrode liquid storage tank (8) is connected with the electrode liquid treatment tank (9) through pipelines and a single-channel peristaltic pump (11); Each electrode chamber is provided with a pH probe (5) which is connected with an automatic control device (7) which is connected with a multichannel peristaltic pump (10), and the multichannel peristaltic pump (10) is respectively connected with the first electrode chamber (2-1), the second electrode chamber (2-2) and the third electrode chamber (2-3); A first PRB reaction wall (3-1) and a second PRB reaction wall (3-2) are installed between the first electrode chamber (2-1) and the second electrode chamber (2-2), at 1/4 and 1/2 of the direction close to the first electrode chamber (2-1) A pH probe (5), a first acid-base regulating liquid inlet pipe (6-1) and a second acid-base regulating liquid inlet pipe (6-2) are respectively arranged between the first PRB reaction wall (3-1) and the second PRB reaction wall (3-3) and the fourth PRB reaction wall (3-4) The pH probe (5) is connected with an automatic control device (7), which is respectively connected with an acid liquor storage tank (12) and an alkali liquor storage tank (13) through pipelines, and then connected with a first acid-base regulating liquid inlet pipe (6-1) and a second acid-base regulating liquid inlet pipe (6-2) through a multichannel peristaltic pump (10)
2. A method for repairing polluted areas by using the device for repairing soil and groundwater polluted by chlorobenzene organic matters as claimed in claim 1, which is characterized by comprising the following steps:
1) examine the land characteristics of the polluted area to determine the overall layout of the remediation device, determine the scope and conductivity of the polluted area, and comprehensively consider the distance between concentric circles to ensure the coverage of all polluted areas to be treated;
2) The first electrode chamber (2-1) and the first electrode (4-1) are installed in the most polluted area, and other electrode chambers and electrodes are arranged in concentric circles;
3) according to the determined electrode areas, two sets of PRB reaction walls are arranged between two electrode areas: 1/2 between anode and cathode And 1/4 away from the anode, so as to meet the needs of simultaneously treating pollutants in groundwater and soil;
4) The electrode liquid is prepared and added into the electrode liquid storage tank (8), and the corresponding acid-base solutions are added into the acid liquid storage tank (12) and the alkali liquid storage tank (13). The prepared electrode liquid is pre-loaded into the electrode chamber. The repair device selects the mixed solution of sodium sulfate and sodium carbonate as the electrode liquid with a concentration of 0.025mol/L, the acid liquid is 5% HCl solution, and the alkali liquid is 1% NaOH solution
) A PH probe (5) is arranged in the polluted area, and a first acid-base adjusting liquid inlet pipe (6-1) and a second acid-base adjusting liquid inlet pipe (6-2) with holes are evenly arranged in the middle of two sets of PRB reaction walls, so as to adjust the pH value of the PRB reaction wall area and keep the pH value of the electrode soil between 7 and 1.When the pH value is too small, it is communicated with the alkali liquor storage tank (13) through the automatic control device to neutralize to a suitable pH range; otherwise, it is communicated with the acid liquor storage tank (12) if the pH value is too large
6) A pH probe (5) in the electrode chamber is used for testing the pH of the electrode solution to check whether the electrode solution is saturated or not, and is connected with an automatic control device (7), and the automatic control device (7) pumps out the saturated electrode solution and injects it into an electrode solution treatment tank (9).After injecting new electrolyte, the electrode liquid recovered from the anode and cathode electrodes can be mixed and transported to the electrode liquid storage tank (8) by the single-channel peristaltic pump (11) after being treated.
3. The method according to claim 2, characterized in that if the polluted area is large, the number of layers of the electrode chamber is increased, but the innermost layer and the outermost layer are ensured to be anodes.
-1/2-
Figure 1
-2/2-
Figure 2
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112605119A (en) * | 2020-12-11 | 2021-04-06 | 师冲冲 | Soil remediation and treatment method |
| CN117602742A (en) * | 2023-12-15 | 2024-02-27 | 广东省环境科学研究院 | Groundwater pollution restoration system and restoration method |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112605119A (en) * | 2020-12-11 | 2021-04-06 | 师冲冲 | Soil remediation and treatment method |
| CN117602742A (en) * | 2023-12-15 | 2024-02-27 | 广东省环境科学研究院 | Groundwater pollution restoration system and restoration method |
| CN117602742B (en) * | 2023-12-15 | 2024-06-04 | 广东省环境科学研究院 | Groundwater pollution restoration system and restoration method |
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