CN104874600A - Electrochemistry flushing method and electrochemical flushing device for contaminated soil - Google Patents
Electrochemistry flushing method and electrochemical flushing device for contaminated soil Download PDFInfo
- Publication number
- CN104874600A CN104874600A CN201510303981.1A CN201510303981A CN104874600A CN 104874600 A CN104874600 A CN 104874600A CN 201510303981 A CN201510303981 A CN 201510303981A CN 104874600 A CN104874600 A CN 104874600A
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- CN
- China
- Prior art keywords
- electrode
- soil
- chamber
- flushing
- electrochemistry
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- 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 66
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000011010 flushing procedure Methods 0.000 title abstract description 18
- 230000005518 electrochemistry Effects 0.000 title abstract description 10
- 238000005067 remediation Methods 0.000 claims abstract description 5
- 238000003411 electrode reaction Methods 0.000 claims description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims 1
- 239000003802 soil pollutant Substances 0.000 claims 1
- 150000002500 ions Chemical class 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 10
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 8
- 238000001556 precipitation Methods 0.000 abstract description 8
- 239000007795 chemical reaction product Substances 0.000 abstract description 7
- 239000007789 gas Substances 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000003795 desorption Methods 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 239000002957 persistent organic pollutant Substances 0.000 abstract 2
- 238000005485 electric heating Methods 0.000 abstract 1
- 238000005406 washing Methods 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 239000011651 chromium Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010828 elution Methods 0.000 description 5
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 2
- 238000000909 electrodialysis Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000009393 electroremediation Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal 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
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- Processing Of Solid Wastes (AREA)
Abstract
The invention provides an electrochemistry flushing method and an electrochemistry flushing device for contaminated soil. The flushing remediation and synchronous treatment of flushing solution for the contaminated soil are realized by using electrochemistry reaction products and the process. A main body of the device comprises an electrode chamber 1, an electrode chamber 4 and a soil chamber 3, wherein the electrode chamber 1 is of a closed structure; the air pressure of the electrode chamber 1 is raised by gases generated on an electrode 2 and presses the flushing solution into the soil to form a flushing process; OH<->(or H<+>) ions generated on the electrode 2 enter the soil to promote the desorption of heavy metal ions and organic pollutants; the power-on electric heating effect is required to raise the temperature of the soil and promote the desorption of the pollutants; the heavy metal ions, the organic pollutants and the OH<->(or H<+>) ions which are flushed to the electrode chamber 4 react with Fe<2+>(or OH<->) ions generated on an electrode 5, and are reduced or form precipitations; the flushing solution in the electrode chamber 4 is pumped into a mud-water separator 6 for separating the precipitations and then the flushing solution is returned to the electrode chamber 4, so that the synchronous treatment of the flushing solution is realized.
Description
Technical field
The present invention relates to contaminated soil remediation field.
Background technology
Contaminated soil drip washing (flushing) technology be by water and or be injected in contaminated soil containing the solution of chemical agent, the pollutant in soil is leached out.This technology can be used as showering technology and uses, and also can be used as based technique for in-situ remediation and uses.Elution technique is suitable for the sandy soil that infiltration coefficient is high, soil porosity is evenly distributed, granularity is larger.For the clay that particle is thinner, because of its poor permeability, sedimentation function is poor, does not usually adopt elution technique.
Electro reclamation (electrokinetic remediation) technology utilizes the electromigration in electrochemistry and electrodialysis effect to be separated from soil by the pollutant in soil, and its effect in clay is better than sandy soil.
In view of drip washing and electric repairing technique are being suitable for the complementary feature in soil types, drip washing combines with electromotive action by Korea S scientific research personnel (Gye-NamKim), form electronic-drip washing recovery technique (electrokinetic-flushingremediation), provide drip washing driving force by water pump.But experimental result display is compared with simple electric repairing technique, and efficiency improve only 2 ~ 6%, does not have positive effect.
No matter be electric repairing technique or electronic-drip washing recovery technique, all only make use of the electromigration in electrochemical process and electrodialysis effect, electrode reaction product and electrocaloric effect all play negative effect wherein, are therefore discharged or control that (gas of electrode reaction is released, soda acid is neutralized; Control the soil moisture by adopting low soil voltage gradient 1 ~ 2V/cm to raise).
Summary of the invention
The present invention passes through mode that is airtight for side electrode cell and raising soil voltage gradient, electrode product and electrocaloric effect are used, it is made to play positive effect to elution technique, form electrochemistry elution technique (electrochemistry-flushing, E-flushing), increase substantially effect and the efficiency of Soil leaching, meanwhile, also utilize electrode reaction product synchronously to process the pollutant in leacheate.
The technical scheme adopted for realizing the object of the invention is: (1) by airtight for side electrode cell 1, on electrode 2 produce gas, H
2(Fig. 1 and Fig. 2) or O
2(Fig. 3) air pressure in this electrode chamber is made to raise, by the leacheate of this electrode cell press-in Zinc fractions lessivation; Another electrode reaction product of this side, OH
-ion (Fig. 1 and Fig. 2) or H
+ion (Fig. 3), enters in soil with leacheate under electric field action, promotes soil heavy metal ion (CrO
4 2-, Pb
2+, Cd
2+, AsO
4 3-deng) and the desorb of organic pollution.
(2) adopt high soil voltage gradient by the soil heat temperature raising in airtight soil chamber 3, promote the desorb of pollutant in soil, meanwhile, the heavy metal ion that high soil voltage gradient also accelerates desorb moves to the speed in another electrode chamber 4.
Move to the heavy metal ion of electrode chamber 4, OH
-ion or H
+the Fe that ion and electrode 5 produce
2+ion (electrode 5 material in Fig. 1 and Fig. 2 is iron) or OH
-ion (in Fig. 3, the material of electrode 5 is inert material, as: graphite, metal platinum, stainless steel etc.) reaction, be reduced or formed sediment, realize the synchronous process to leacheate.
Leacheate in electrode cell 4 is pumped in separator for mud and water 6 by water circulating pump, is separated by the sediment in leacheate by the mud-water separation such as free settling, centrifugation technology, and clean leacheate returns to electrode cell 4.
Accompanying drawing explanation
The nonlimiting examples that the present invention can be provided by accompanying drawing further illustrates.
The heavy metal that Fig. 1 exists for acid group form and organic polluted soil electrochemistry drip washing vertical unit structural representation.
The heavy metal that Fig. 2 exists for acid group form and organic polluted soil electrochemistry drip washing horizontal type device structural representation
Fig. 3 is for the heavy-metal contaminated soil electrochemistry drip washing vertical unit structural representation existed with cationic form
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described, but should not be construed the above-mentioned subject area of the present invention and be only limitted to following embodiment.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and customary means, make various replacement and change, all should be included in the scope of the present invention.
Embodiment 1:
In the present embodiment, industrial sites soil pollute by chromium (VI), Cr (VI) concentration is 2740mg/kg, uses the device in Fig. 1 to carry out E-flushing reparation to this soil, reparative experiment 60min.
Electrode 2 is negative electrode, electrode 5 is anode, and the two is irony electrode, and leacheate is the NaCl solution of 0.005mol/L, 1cm after soil horizon.In repair process, soil voltage 35.5V/cm, the soil moisture rises to 52 DEG C by 14 DEG C.The H of release on negative electrode 2
2gas makes air pressure in airtight cathode chamber 1 raise, and leacheate is pressed into soil horizon 3 and forms lessivation.Another product OH on negative electrode 2
-ion enters in soil with leacheate under electric field action, promotes CrO by competitive Adsorption
4 2-ion (Cr (VI) in soil with CrO
4 2-form exist) get off to enter leacheate from soil particle surface desorption.Meanwhile, the rising of the soil moisture also greatly facilitates CrO
4 2-desorb.In addition, lessivation also prevents OH
-ion forms alkali interface in soil, brings negative effect to repair process.The CrO that desorb is got off
4 2-ion and part OH
-ion, under drip washing and electromigratory acting in conjunction, leaves soil with the maximum 2.5min consuming time of the speed of 0.41cm/min and enters anode chamber 4 (same thickness of soil, electro reclamation adopts the voltage gradient 100min consuming time of 1V/cm).In anode chamber 4, the electrode reaction product Fe of anode 5
2+with CrO
4 2-ionic reaction generates the Cr of low toxicity
3+ion and Fe
3+ion, the two passes the OH that soil horizon enters anode chamber again with leacheate
-ionic reaction generates Cr (OH)
3with Fe (OH)
3precipitation, leacheate is pumped to Cr (OH) again in settling vessel 6
3with Fe (OH)
3precipitation is separated from leacheate.During this E-flushing tests, in soil, the clearance of Cr (VI) reaches 38%, and in the contrast drip washing experiment carried out in same sampling device, the clearance of Cr (VI) is only 17%, and the present invention makes the remediation efficiency of drip washing be more than doubled.
Embodiment 2:
In the present embodiment, the device in Fig. 1 and Fig. 2 is used to carry out E-flushing reparation to polycyclic aromatic hydrocarbon pollution.
Electrode 2 is negative electrode, electrode 5 is anode, and the two is irony electrode, and leacheate is the NaCl solution of 0.005mol/L, 20cm after soil horizon, soil voltage 500V/cm.In repair process, the H of release on negative electrode 2
2gas makes air pressure in airtight cathode chamber 1 raise, and leacheate is pressed into soil horizon 3 and forms lessivation.Another product OH on negative electrode 2
-ion enters in soil with leacheate under electric field action, is that soil pH raises, thus promotes the desorb of polycyclic aromatic hydrocarbon.Meanwhile, the rising of the soil moisture also greatly facilitates the desorb of polycyclic aromatic hydrocarbon.The polycyclic aromatic hydrocarbon that desorb is got off and part OH
-ion enters anode chamber 4 under drip washing and electromigratory acting in conjunction.In anode chamber 4, the electrode reaction product Fe of anode 5
2+and react with dissolved oxygen the Fe generated
3+ion and the OH entering anode chamber with leacheate through soil horizon
-ionic reaction generates Fe (OH)
2with Fe (OH)
3precipitation, Fe (OH)
2with Fe (OH)
3to be pumped in settling vessel 6 with leacheate as coagulant and by coagulating sedimentation effect, polycyclic aromatic hydrocarbon to be removed from leacheate.
Embodiment 3:
In the present embodiment, Fig. 3 shown device is used to carry out E-flushing reparation to lead-contaminated soil.
In this device, electrode 2 is anode, electrode 5 is negative electrode, and the two is graphite electrode, and leacheate is the NaNO of 0.005mol/L
3solution, 50cm after soil horizon, soil voltage 300V/cm.In repair process, the O of release on anode 2
2gas makes air pressure in airtight anode chamber 1 raise, and leacheate is pressed into airtight soil horizon 3 and forms lessivation.Another product H on anode 2
+ion enters in soil with leacheate under electric field action, promotes Pb by competitive Adsorption
2+ion (plumbous in soil with Pb
2+form exist) get off to enter leacheate from soil particle surface desorption.Meanwhile, the rising of the soil moisture also greatly facilitates Pb
2+desorb.In addition, lessivation also prevents the formation at acid, alkali interface in soil.The Pb that desorb is got off
2+ion and part H
+ion, under drip washing and electromigratory acting in conjunction, enters cathode chamber 4.In cathode chamber 4, Pb
2+the electrode reaction product OH of ion and negative electrode 5
-ionic reaction generates Pb (OH)
2precipitation, containing Pb (OH)
2the leacheate of precipitation is pumped to Pb (OH) in settling vessel 6
2precipitation is separated from leacheate.
Claims (2)
1. a contaminated soil remediation method;
It is characterized in that: contaminated soil is positioned in the middle of two electrode chambers, and wherein an electrode chamber is airtight, the gas that in this electrode chamber, electrode reaction produces makes electrode chamber air pressure raise, and drive electrode liquid enters Zinc fractions lessivation.
2. realize the device that method according to claim 1 adopts;
It is characterized in that: the device realizing method described in claim 1 is made up of cathode chamber, anode chamber and the soil chamber be positioned at therebetween, wherein cathode chamber or anode chamber are according to handled soil pollutant difference, and one seals another and opens wide; Air pressure in airtight electrode chamber raises because of the gas of electrode reaction release in galvanization, electrode solution is pressed into Zinc fractions lessivation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510303981.1A CN104874600B (en) | 2015-06-05 | 2015-06-05 | Contaminated soil electrochemistry ELUTION METHOD and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510303981.1A CN104874600B (en) | 2015-06-05 | 2015-06-05 | Contaminated soil electrochemistry ELUTION METHOD and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104874600A true CN104874600A (en) | 2015-09-02 |
| CN104874600B CN104874600B (en) | 2017-07-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510303981.1A Expired - Fee Related CN104874600B (en) | 2015-06-05 | 2015-06-05 | Contaminated soil electrochemistry ELUTION METHOD and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104874600B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106269842A (en) * | 2016-09-13 | 2017-01-04 | 山东师范大学 | Electrochemical oxidation drip washing Cr contaminated soil processes integrated apparatus and processing method |
| CN110142290A (en) * | 2019-05-16 | 2019-08-20 | 浙江省有色金属地质勘查局 | A kind of heavy-metal contaminated soil electro reclamation device and method |
| CN111687203A (en) * | 2020-07-16 | 2020-09-22 | 常州大学 | Device and method for remedying heavy metal contaminated soil through light energy-vertical electrokinetic remediation |
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| US5476992A (en) * | 1993-07-02 | 1995-12-19 | Monsanto Company | In-situ remediation of contaminated heterogeneous soils |
| CN101507969A (en) * | 2009-03-13 | 2009-08-19 | 昆明理工大学 | Reinforced electric repair method of heavy metal polluted soil using anode liquor as eluant |
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2015
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Patent Citations (7)
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Non-Patent Citations (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106269842A (en) * | 2016-09-13 | 2017-01-04 | 山东师范大学 | Electrochemical oxidation drip washing Cr contaminated soil processes integrated apparatus and processing method |
| CN110142290A (en) * | 2019-05-16 | 2019-08-20 | 浙江省有色金属地质勘查局 | A kind of heavy-metal contaminated soil electro reclamation device and method |
| CN111687203A (en) * | 2020-07-16 | 2020-09-22 | 常州大学 | Device and method for remedying heavy metal contaminated soil through light energy-vertical electrokinetic remediation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104874600B (en) | 2017-07-04 |
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Effective date of registration: 20200803 Address after: No.24-6, no.6, Huayu Plaza, Shapingba District, Chongqing Patentee after: Chongqing Shuhan Environmental Protection Engineering Co.,Ltd. Address before: 400044 Shapingba District Sha Street, No. 174, Chongqing Patentee before: Chongqing University |
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Granted publication date: 20170704 |