CN107470341A - A kind of restorative procedure of heavy-metal contaminated soil - Google Patents
A kind of restorative procedure of heavy-metal contaminated soil Download PDFInfo
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- CN107470341A CN107470341A CN201710618034.0A CN201710618034A CN107470341A CN 107470341 A CN107470341 A CN 107470341A CN 201710618034 A CN201710618034 A CN 201710618034A CN 107470341 A CN107470341 A CN 107470341A
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 130
- 239000002689 soil Substances 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000004094 surface-active agent Substances 0.000 claims abstract description 141
- 230000002441 reversible effect Effects 0.000 claims abstract description 138
- 239000007864 aqueous solution Substances 0.000 claims abstract description 76
- 239000006260 foam Substances 0.000 claims abstract description 70
- 239000002738 chelating agent Substances 0.000 claims abstract description 56
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 44
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 23
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000007787 solid Substances 0.000 claims abstract description 12
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 10
- 239000011261 inert gas Substances 0.000 claims abstract description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- -1 diethyl pentetic acid Chemical compound 0.000 claims description 13
- 230000003213 activating effect Effects 0.000 claims description 10
- SHZGCJCMOBCMKK-UHFFFAOYSA-N D-mannomethylose Natural products CC1OC(O)C(O)C(O)C1O SHZGCJCMOBCMKK-UHFFFAOYSA-N 0.000 claims description 6
- SHZGCJCMOBCMKK-JFNONXLTSA-N L-rhamnopyranose Chemical compound C[C@@H]1OC(O)[C@H](O)[C@H](O)[C@H]1O SHZGCJCMOBCMKK-JFNONXLTSA-N 0.000 claims description 6
- PNNNRSAQSRJVSB-UHFFFAOYSA-N L-rhamnose Natural products CC(O)C(O)C(O)C(O)C=O PNNNRSAQSRJVSB-UHFFFAOYSA-N 0.000 claims description 6
- 235000006408 oxalic acid Nutrition 0.000 claims description 6
- 239000001397 quillaja saponaria molina bark Substances 0.000 claims description 4
- 229930182490 saponin Natural products 0.000 claims description 4
- 150000007949 saponins Chemical class 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical group OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 3
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 claims description 3
- 229960001484 edetic acid Drugs 0.000 claims description 3
- 229960003330 pentetic acid Drugs 0.000 claims description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N anhydrous guanidine Natural products NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 2
- 125000003739 carbamimidoyl group Chemical group C(N)(=N)* 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 2
- 125000002636 imidazolinyl group Chemical group 0.000 claims description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 1
- 150000003870 salicylic acids Chemical class 0.000 claims 1
- 238000005067 remediation Methods 0.000 abstract description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 45
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 45
- 229910052804 chromium Inorganic materials 0.000 description 45
- 239000011651 chromium Substances 0.000 description 45
- 229910052802 copper Inorganic materials 0.000 description 45
- 239000010949 copper Substances 0.000 description 45
- 238000011084 recovery Methods 0.000 description 11
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 9
- 239000006004 Quartz sand Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- AAUVMHNVCYAQBT-UHFFFAOYSA-N octadecanimidamide Chemical group CCCCCCCCCCCCCCCCCC(N)=N AAUVMHNVCYAQBT-UHFFFAOYSA-N 0.000 description 6
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 6
- NEWLFIGHDAFCHW-UHFFFAOYSA-N tetradecanimidamide Chemical group CCCCCCCCCCCCCC(N)=N NEWLFIGHDAFCHW-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 229940093476 ethylene glycol Drugs 0.000 description 3
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 3
- 229960004889 salicylic acid Drugs 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 235000005979 Citrus limon Nutrition 0.000 description 2
- 244000248349 Citrus limon Species 0.000 description 2
- 241000790917 Dioxys <bee> Species 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 125000003916 ethylene diamine group Chemical group 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006262 metallic foam Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 235000017709 saponins Nutrition 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel 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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to a kind of restorative procedure of heavy-metal contaminated soil, belong to technical field of soil remediation.Heavy-metal contaminated soil is crushed to particle diameter and is not more than 50 mm by the present invention；Reversible surfactant is added to the water, carbon dioxide is then passed to and obtains reversible surfactant carbonate aqueous solution；By reversible surfactant carbonate aqueous solution, the chelating agent aqueous solution, CO2Gas, which is each led into porous media, obtains reversible surfactant foam；Reversible surfactant foam is at the uniform velocity blasted pollution-free soil and foam containing heavy metal are obtained in broken heavy-metal contaminated soil；Air or inert gas are passed through in foam containing heavy metal, stood, lower floor's solid is the reversible surfactant reclaimed.The present invention not only can efficiently remove heavy metal in soil, can also realize efficiently separating for surface-active and heavy metal by adjusting gas component, recycle surfactant, reduce rehabilitation cost.
Description
Technical field
The present invention relates to a kind of restorative procedure of heavy-metal contaminated soil, belong to technical field of soil remediation.
Background technology
China's heavy metal pollution of soil outstanding problem, the hm of contaminated cultivated area about 20002.Serious heavy metal-polluted soil
Pollute food-safe, ecological environment and health of the masses constitutes serious threat, eager demand heavy-metal contaminated soil reparation
Technology.The recovery technique of heavy-metal contaminated soil includes peripheral doses, chemical remediation and biological prosthetic at present.Based on surface-active
The chemical leaching technology of agent is the recovery technique of current most prospect.But the technology by stratum media hypotonicity and it is non-
The limitation of even property, chemical leaching liquid are also easy to produce Hole bottom cavity blast (leacheate easily flows along the medium duct of good penetrability), it is difficult to cover
Whole Polluted area is covered, causes repairing effect low；Leacheate is easily affected by gravity simultaneously, causes its migration unmanageable, easily
Into water-bearing layer, cause Polluted area to expand, cause secondary pollution.
Surfactant foam restorative procedure is the contaminated soil remediation technology of developed recently, because foam has mobility
By force, it is evenly distributed in soil, is affected by gravity the advantages that small and receives significant attention.Li Ying et al. discloses one kind and utilizes surface
The water base foam that activating agent is formed removes the method [CN103909090A] of heavy metal in soil ion, because of surfactant foam
In colloid be easy to heavy metal stable mixed system formed by coordination and suction-operated, adsorb the surfactant bubble of heavy metal
Foam is difficult to separate, and cost height and complex process, limits popularization of the invention in actual pollution amelioration.
The content of the invention
The present invention after the water base steel foams of surfactant, chelating heavy metal for separating the problem of difficult, there is provided Yi Zhongchong
The restorative procedure of metallic pollution soil, this method are lived based on the switch reversible controllable characteristic of surfactant using surface is switched
Property agent water base foam absorption, solubilized heavy metal realize heavy metal pollution of soil reparation, lived by the surface for regulating and controlling solubilized heavy metal
Property agent foam fraction factor surfactant, realizes the recycling of surfactant.
A kind of restorative procedure of heavy-metal contaminated soil, is concretely comprised the following steps：
（1）Heavy-metal contaminated soil is crushed to particle diameter and is not more than 50mm；
（2）Reversible surfactant is added to the water, carbon dioxide is then passed to and obtains reversible surfactant carbonate water
Solution；
（3）By step（2）The reversible surfactant carbonate aqueous solution of gained, the chelating agent aqueous solution, CO2Gas each leads into more
Reversible surfactant foam is obtained in the medium of hole；
（4）By step（3）The reversible surfactant foam of gained at the uniform velocity blasts step（1）In broken heavy-metal contaminated soil
To pollution-free soil and foam containing heavy metal；
（5）Air or inert gas are passed through step（4）In gained foam containing heavy metal, stand, lower floor's solid is reversible table
Face activating agent；
The step（2）In reversible surfactant be containing amidino groups, guanidine radicals, imidazoline functional groups chain alkyl (R=C8~
C18) one or more in compound；
The step（2）In in reversible surfactant carbonate aqueous solution the mass percent concentration of reversible surfactant be
0.1~2%；
The step（3）The mass percent concentration of chelating agent is 1 ~ 5% in the middle chelating agent aqueous solution, and chelating agent is ethylenediamine tetraacetic
Acetic acid (EDTA), diethyl pentetic acid (DTPA), ethyleneglycol bistetraacetic acid (EGTA), rhamnose, saponin, oxalic acid, lemon
One or more in lemon acid, salicylic acid；
The step（3）The porosity of middle porous media is not less than 3%, and particle diameter is 0.05 ~ 50 mm；
The step（3）In reversible surfactant carbonate aqueous solution, CO2Gas, the velocity ratio of the chelating agent aqueous solution are 1:
(0.02~0.5):(0.05~0.8)；
The step（4）In the flow velocity of reversible surfactant foam be 0.02 ~ 100mL/min, and foam volume and soil matter
Amount ratio is not less than 5mL/g.
The present invention is to be based on CO2The reversible surfactant of type gas and CO2Reaction produces the carbonate with surface-active,
Be changed into non-live condition after being passed through air or inert gas, and it is not soluble in water easily precipitate this characteristic, to solve surfactant
After heavy metal in foam rehabilitating soil, surfactant be difficult to separation the problem of.
Beneficial effects of the present invention：
（1）The inventive method is respectively provided with good removal effect, and the basicity of resistance to soil, salinity to an a variety of huge sum of moneys in soil, can
Different type heavy-metal contaminated soil is repaired；
（2）The inventive method toward absorption heavy metal switch surfactant water based foam system in be passed through air or indifferent gas
Body, switch surfactant is inactivated, is changed into precipitation state, realize efficiently separating for surfactant and heavy metal, so as to real
The recycling of existing surfactant, there are simple to operate, surfactant organic efficiency height, low cost and other advantages, be advantageous to
The popularization and application of foam repairing polluted soil technology.
Embodiment
The present invention is described in further detail with reference to embodiment, but protection scope of the present invention and unlimited
In the content.
Embodiment 1：Heavy-metal contaminated soil in the present embodiment using Yunnan somewhere heavy-metal contaminated soil as sample, its
Middle heavy metal chromium, every, the content of lead, copper for the mg/kg of chromium 279, every 95 mg/kg, the mg/kg of lead 2186, the mg/kg of copper 82；
A kind of restorative procedure of heavy-metal contaminated soil, is concretely comprised the following steps：
（1）Heavy-metal contaminated soil is crushed to particle diameter and is not more than 20mm；
（2）By reversible surfactant（Reversible surfactant is dodecyl ethanamidine）It is added to the water, then passes to dioxy
Change carbon and obtain reversible surfactant carbonate aqueous solution；Reversible surface is lived in wherein reversible surfactant carbonate aqueous solution
Property agent（Dodecyl ethanamidine）Mass percent concentration be 1%；
（3）By step（2）The reversible surfactant carbonate aqueous solution of gained, the chelating agent aqueous solution, CO2Gas each leads into more
Reversible surfactant foam is obtained in the medium of hole；The mass percent concentration of chelating agent is 2% wherein in the chelating agent aqueous solution,
Chelating agent is ethylenediamine tetra-acetic acid；Reversible surfactant carbonate aqueous solution, CO2Gas, chelating agent（Ethylenediamine tetra-acetic acid）
The velocity ratio of the aqueous solution is 1:0.2:0.05；Porous media is fine quartz sand, particle diameter 5mm；
（4）By step（3）The reversible surfactant foam of gained at the uniform velocity blasts step（1）In broken heavy-metal contaminated soil
To pollution-free soil and foam containing heavy metal, wherein the flow velocity of reversible surfactant foam is 2mL/min；
（5）Air is passed through step（4）In gained foam containing heavy metal, stand, lower floor's solid is reversible surfactant；Its
The flow velocity of middle air is 5mL/min；
Heavy metal chromium after contaminated soil remediation obtained by the present embodiment, every, the content of lead, copper for the mg/kg of chromium 6.7, every 2.4 mg/
Kg, the mg/kg of lead 24.1, the mg/kg of copper 1.5, are computed, heavy metal chromium, every, the clearance of lead, copper be respectively 97.6%,
97.5%、98.9%、98.2%；Reversible surfactant（Dodecyl ethanamidine）The rate of recovery be 87.9%.
Embodiment 2：Heavy-metal contaminated soil in the present embodiment using Yunnan somewhere heavy-metal contaminated soil as sample, its
Middle heavy metal chromium, every, the content of lead, copper for the mg/kg of chromium 279, every 95 mg/kg, the mg/kg of lead 2186, the mg/kg of copper 82；
A kind of restorative procedure of heavy-metal contaminated soil, is concretely comprised the following steps：
（1）Heavy-metal contaminated soil is crushed to particle diameter and is not more than 30mm；
（2）By reversible surfactant（Reversible surfactant is cetyl ethanamidine）It is added to the water, then passes to dioxy
Change carbon and obtain reversible surfactant carbonate aqueous solution；Reversible surface is lived in wherein reversible surfactant carbonate aqueous solution
Property agent（Cetyl ethanamidine）Mass percent concentration be 1%；
（3）By step（2）The reversible surfactant carbonate aqueous solution of gained, the chelating agent aqueous solution, CO2Gas each leads into more
Reversible surfactant foam is obtained in the medium of hole；The mass percent concentration of chelating agent is 2% wherein in the chelating agent aqueous solution,
Chelating agent is diethyl pentetic acid；Reversible surfactant carbonate aqueous solution, CO2Gas, chelating agent（Diethyl triamine
Pentaacetic acid）The velocity ratio of the aqueous solution is 1:0.2:0.3；Porous media is fine quartz sand, particle diameter 0.05mm；
（4）By step（3）The reversible surfactant foam of gained at the uniform velocity blasts step（1）In broken heavy-metal contaminated soil
To pollution-free soil and foam containing heavy metal, wherein the flow velocity of reversible surfactant foam is 0.02mL/min；
（5）Air is passed through step（4）In gained foam containing heavy metal, stand, lower floor's solid is reversible surfactant；Its
The flow velocity of middle air is 5mL/min；
Heavy metal chromium after contaminated soil remediation obtained by the present embodiment, every, the mass percent content of lead, copper be the mg/ of chromium 13.4
Kg, every 3.1 mg/kg, the mg/kg of lead 39.4, the mg/kg of copper 2.8, be computed, heavy metal chromium, every, the clearance difference of lead, copper
For 95.2%, 96.7%, 98.2%, 96.6%；Reversible surfactant（Cetyl ethanamidine）The rate of recovery be 88.5%.
Embodiment 3：Heavy-metal contaminated soil in the present embodiment using Yunnan somewhere heavy-metal contaminated soil as sample, its
Middle heavy metal chromium, every, the content of lead, copper for the mg/kg of chromium 279, every 95 mg/kg, the mg/kg of lead 2186, the mg/kg of copper 82；
A kind of restorative procedure of heavy-metal contaminated soil, is concretely comprised the following steps：
（1）Heavy-metal contaminated soil is crushed to particle diameter and is not more than 40mm；
（2）By reversible surfactant（Reversible surfactant is dodecyl ethanamidine and cetyl ethanamidine）It is added to water
In, then pass to carbon dioxide and obtain reversible surfactant carbonate aqueous solution；Wherein reversible surfactant carbonate water
Reversible surfactant in solution（Dodecyl ethanamidine and cetyl ethanamidine）Mass percent concentration be 1%；
（3）By step（2）The reversible surfactant carbonate aqueous solution of gained, the chelating agent aqueous solution, CO2Gas each leads into more
Reversible surfactant foam is obtained in the medium of hole；The mass percent concentration of chelating agent is 2% wherein in the chelating agent aqueous solution,
Chelating agent is ethyleneglycol bistetraacetic acid；Reversible surfactant carbonate aqueous solution, CO2Gas, chelating agent（The double tetrems of ethylene glycol
Acid）The velocity ratio of the aqueous solution is 1:0.5:0.3；Porous media is quartz sand, particle diameter 50mm；
（4）By step（3）The reversible surfactant foam of gained at the uniform velocity blasts step（1）In broken heavy-metal contaminated soil
To pollution-free soil and foam containing heavy metal, wherein the flow velocity of reversible surfactant foam is 2mL/min；
（5）Air is passed through step（4）In gained foam containing heavy metal, stand, lower floor's solid is reversible surfactant；Its
The flow velocity of middle air is 5mL/min；
Heavy metal chromium after contaminated soil remediation obtained by the present embodiment, every, the mass percent content of lead, copper be the mg/kg of chromium 0.8,
Every 0.8 mg/kg, the mg/kg of lead 37.2, the mg/kg of copper 1.5, it is computed, heavy metal chromium, every, the clearance of lead, copper is respectively
99.7%、99.2%、98.3%、98.2%；Reversible surfactant（Cetyl ethanamidine）The rate of recovery be 83.5%.
Embodiment 4：Heavy-metal contaminated soil in the present embodiment using Yunnan somewhere heavy-metal contaminated soil as sample, its
Middle heavy metal chromium, every, the content of lead, copper for the mg/kg of chromium 279, every 95 mg/kg, the mg/kg of lead 2186, the mg/kg of copper 82；
A kind of restorative procedure of heavy-metal contaminated soil, is concretely comprised the following steps：
（1）Heavy-metal contaminated soil is crushed to particle diameter and is not more than 10 mm；
（2）By reversible surfactant（Reversible surfactant is dodecyl TMG）It is added to the water, then passes to
Carbon dioxide obtains reversible surfactant carbonate aqueous solution；Reversible table in wherein reversible surfactant carbonate aqueous solution
Face activating agent（Dodecyl TMG）Mass percent concentration be 0.1%；
（3）By step（2）The reversible surfactant carbonate aqueous solution of gained, the chelating agent aqueous solution, CO2Gas each leads into more
Reversible surfactant foam is obtained in the medium of hole；The mass percent concentration of chelating agent is 1% wherein in the chelating agent aqueous solution,
Chelating agent is rhamnose；Reversible surfactant carbonate aqueous solution, CO2Gas, chelating agent（Rhamnose）The flow velocity of the aqueous solution
Than for 1:0.02:0.8；The particle diameter of porous media is 10mm fine quartz sand；
（4）By step（3）The reversible surfactant foam of gained at the uniform velocity blasts step（1）In broken heavy-metal contaminated soil
To pollution-free soil and foam containing heavy metal, wherein the flow velocity of reversible surfactant foam is 10 mL/min；
（5）Air is passed through step（4）In gained foam containing heavy metal, stand, lower floor's solid is reversible surfactant；Its
The flow velocity of middle air is 5mL/min；
Heavy metal chromium after contaminated soil remediation obtained by the present embodiment, every, the mass percent content of lead, copper be the mg/ of chromium 72.0
Kg, every 17.8 mg/kg, the mg/kg of lead 520.3, the mg/kg of copper 22.0, be computed, heavy metal chromium, every, the clearance point of lead, copper
Wei 74.2%, 81.3%, 76.2%, 73.2%；Reversible surfactant（Dodecyl TMG）The rate of recovery be 91.2%.
Embodiment 5：Heavy-metal contaminated soil in the present embodiment using Yunnan somewhere heavy-metal contaminated soil as sample, its
Middle heavy metal chromium, every, the content of lead, copper for the mg/kg of chromium 279, every 95 mg/kg, the mg/kg of lead 2186, the mg/kg of copper 82；
A kind of restorative procedure of heavy-metal contaminated soil, is concretely comprised the following steps：
（1）Heavy-metal contaminated soil is crushed to particle diameter and is not more than 40mm；
（2）By reversible surfactant（Reversible surfactant is dodecyl TMG）It is added to the water, then passes to
Carbon dioxide obtains reversible surfactant carbonate aqueous solution；Reversible table in wherein reversible surfactant carbonate aqueous solution
Face activating agent（Dodecyl TMG）Mass percent concentration be 1%；
（3）By step（2）The reversible surfactant carbonate aqueous solution of gained, the chelating agent aqueous solution, CO2Gas each leads into more
Reversible surfactant foam is obtained in the medium of hole；The mass percent concentration of chelating agent is 2% wherein in the chelating agent aqueous solution,
Chelating agent is rhamnose；Reversible surfactant carbonate aqueous solution, CO2Gas, chelating agent（Rhamnose）The flow velocity of the aqueous solution
Than for 1:0.5:0.8；The particle diameter of porous media is 15mm fine quartz sand；
（4）By step（3）The reversible surfactant foam of gained at the uniform velocity blasts step（1）In broken heavy-metal contaminated soil
To pollution-free soil and foam containing heavy metal, wherein the flow velocity of reversible surfactant foam is 10mL/min；
（5）Air is passed through step（4）In gained foam containing heavy metal, stand, lower floor's solid is reversible surfactant；Its
The flow velocity of middle air is 5mL/min；
Heavy metal chromium after contaminated soil remediation obtained by the present embodiment, every, the mass percent content of lead, copper be the mg/kg of chromium 7.5,
Every 3.3 mg/kg, the mg/kg of lead 104.9, the mg/kg of copper 3.2, it is computed, heavy metal chromium, every, the clearance of lead, copper is respectively
97.3%、96.5%、95.2%、96.1%；Reversible surfactant（Dodecyl TMG）The rate of recovery be 88.4%.
Embodiment 6：Heavy-metal contaminated soil in the present embodiment using Yunnan somewhere heavy-metal contaminated soil as sample, its
Middle heavy metal chromium, every, the content of lead, copper for the mg/kg of chromium 279, every 95 mg/kg, the mg/kg of lead 2186, the mg/kg of copper 82；
A kind of restorative procedure of heavy-metal contaminated soil, is concretely comprised the following steps：
（1）Heavy-metal contaminated soil is crushed to particle diameter and is not more than 50mm；
（2）By reversible surfactant（Reversible surfactant is dodecyl TMG）It is added to the water, then passes to
Carbon dioxide obtains reversible surfactant carbonate aqueous solution；Reversible table in wherein reversible surfactant carbonate aqueous solution
Face activating agent（Dodecyl TMG）Mass percent concentration be 0.1%；
（3）By step（2）The reversible surfactant carbonate aqueous solution of gained, the chelating agent aqueous solution, CO2Gas each leads into more
Reversible surfactant foam is obtained in the medium of hole；The mass percent concentration of chelating agent is 5% wherein in the chelating agent aqueous solution,
Chelating agent is saponin；Reversible surfactant carbonate aqueous solution, CO2Gas, chelating agent（Saponin）The flow velocity of the aqueous solution
Than for 1:0.5:0.1；The particle diameter of porous media is 5mm fine quartz sand；
（4）By step（3）The reversible surfactant foam of gained at the uniform velocity blasts step（1）In broken heavy-metal contaminated soil
To pollution-free soil and foam containing heavy metal, wherein the flow velocity of reversible surfactant foam is 100mL/min；
（5）Air is passed through step（4）In gained foam containing heavy metal, stand, lower floor's solid is reversible surfactant；Its
The flow velocity of middle air is 5mL/min；
Heavy metal chromium after contaminated soil remediation obtained by the present embodiment, every, the mass percent content of lead, copper be the mg/ of chromium 32.6
Kg, every 14.2 mg/kg, the mg/kg of lead 190.2, the mg/kg of copper 16.8, be computed, heavy metal chromium, every, the clearance point of lead, copper
Wei 88.3%, 85.1%, 91.3%, 79.5%；Reversible surfactant（Dodecyl TMG）The rate of recovery be 82.3%.
Embodiment 7：Heavy-metal contaminated soil in the present embodiment using Yunnan somewhere heavy-metal contaminated soil as sample, its
Middle heavy metal chromium, every, the content of lead, copper for the mg/kg of chromium 279, every 95 mg/kg, the mg/kg of lead 2186, the mg/kg of copper 82；
A kind of restorative procedure of heavy-metal contaminated soil, is concretely comprised the following steps：
（1）Heavy-metal contaminated soil is crushed to particle diameter and is not more than 15 mm；
（2）By reversible surfactant（Reversible surfactant is 2- dodecyl -1- hydroxyethyl imidazole quinolines）It is added to the water,
Then pass to carbon dioxide and obtain reversible surfactant carbonate aqueous solution；Wherein reversible surfactant carbonate aqueous solution
In reversible surfactant（2- dodecyl -1- hydroxyethyl imidazole quinolines）Mass percent concentration be 0.1%；
（3）By step（2）The reversible surfactant carbonate aqueous solution of gained, the chelating agent aqueous solution, CO2Gas each leads into more
Reversible surfactant foam is obtained in the medium of hole；The mass percent concentration of chelating agent is 1% wherein in the chelating agent aqueous solution,
Chelating agent is oxalic acid；Reversible surfactant carbonate aqueous solution, CO2Gas, chelating agent（Oxalic acid）The velocity ratio of the aqueous solution is
1:0.02:0.8；The particle diameter of porous media is 5mm fine quartz sand；
（4）By step（3）The reversible surfactant foam of gained at the uniform velocity blasts step（1）In broken heavy-metal contaminated soil
To pollution-free soil and foam containing heavy metal, wherein the flow velocity of reversible surfactant foam is 10 mL/min；
（5）Air is passed through step（4）In gained foam containing heavy metal, stand, lower floor's solid is reversible surfactant；Its
The flow velocity of middle air is 5mL/min；
Heavy metal chromium after contaminated soil remediation obtained by the present embodiment, every, the mass percent content of lead, copper be the mg/ of chromium 85.1
Kg, every 26.5 mg/kg, the mg/kg of lead 490.0, the mg/kg of copper 26.1, be computed, heavy metal chromium, every, the clearance point of lead, copper
Wei 69.5%, 72.1%, 77.6%, 68.2%；Reversible surfactant（2- dodecyl -1- hydroxyethyl imidazole quinolines）The rate of recovery
For 90.4%.
Embodiment 8：Heavy-metal contaminated soil in the present embodiment using Yunnan somewhere heavy-metal contaminated soil as sample, its
Middle heavy metal chromium, every, the content of lead, copper for the mg/kg of chromium 279, every 95 mg/kg, the mg/kg of lead 2186, the mg/kg of copper 82；
A kind of restorative procedure of heavy-metal contaminated soil, is concretely comprised the following steps：
（1）Heavy-metal contaminated soil is crushed to particle diameter and is not more than 20mm；
（2）By reversible surfactant（Reversible surfactant is 2- dodecyl -1- hydroxyethyl imidazole quinolines）It is added to the water,
Then pass to carbon dioxide and obtain reversible surfactant carbonate aqueous solution；Wherein reversible surfactant carbonate aqueous solution
In reversible surfactant（2- dodecyl -1- hydroxyethyl imidazole quinolines）Mass percent concentration be 2%；
（3）By step（2）The reversible surfactant carbonate aqueous solution of gained, the chelating agent aqueous solution, CO2Gas each leads into more
Reversible surfactant foam is obtained in the medium of hole；The mass percent concentration of chelating agent is 2% wherein in the chelating agent aqueous solution,
Chelating agent is oxalic acid；Reversible surfactant carbonate aqueous solution, CO2Gas, chelating agent（Oxalic acid）The velocity ratio of the aqueous solution is
1:0.5:0.8；The particle diameter of porous media is 5mm fine quartz sand；
（4）By step（3）The reversible surfactant foam of gained at the uniform velocity blasts step（1）In broken heavy-metal contaminated soil
To pollution-free soil and foam containing heavy metal, wherein the flow velocity of reversible surfactant foam is 10 mL/min；
（5）Air is passed through step（4）In gained foam containing heavy metal, stand, lower floor's solid is reversible surfactant；Its
The flow velocity of middle air is 5mL/min；
Heavy metal chromium after contaminated soil remediation obtained by the present embodiment, every, the mass percent content of lead, copper be the mg/kg of chromium 9.5,
Every 6.3 mg/kg, the mg/kg of lead 59.0, the mg/kg of copper 3.1, it is computed, heavy metal chromium, every, the clearance of lead, copper is respectively
96.6%、93.4%、97.3%、96.2%；Reversible surfactant（2- dodecyl -1- hydroxyethyl imidazole quinolines）The rate of recovery be
90.4%。
Embodiment 9：Heavy-metal contaminated soil in the present embodiment using Yunnan somewhere heavy-metal contaminated soil as sample, its
Middle heavy metal chromium, every, the content of lead, copper for the mg/kg of chromium 279, every 95 mg/kg, the mg/kg of lead 2186, the mg/kg of copper 82；
A kind of restorative procedure of heavy-metal contaminated soil, is concretely comprised the following steps：
（1）Heavy-metal contaminated soil is crushed to particle diameter and is not more than 50mm；
（2）By reversible surfactant（Reversible surfactant is 2- dodecyl -1- hydroxyethyl imidazole quinolines）It is added to the water,
Then pass to carbon dioxide and obtain reversible surfactant carbonate aqueous solution；Wherein reversible surfactant carbonate aqueous solution
In reversible surfactant（2- dodecyl -1- hydroxyethyl imidazole quinolines）Mass percent concentration be 0.1%；
（3）By step（2）The reversible surfactant carbonate aqueous solution of gained, the chelating agent aqueous solution, CO2Gas each leads into more
Reversible surfactant foam is obtained in the medium of hole；The mass percent concentration of chelating agent is 5% wherein in the chelating agent aqueous solution,
Chelating agent is salicylic acid；Reversible surfactant carbonate aqueous solution, CO2Gas, chelating agent（Salicylic acid）The flow velocity of the aqueous solution
Than for 1:0.5:0.1；The particle diameter of porous media is 5mm fine quartz sand；
（4）By step（3）The reversible surfactant foam of gained at the uniform velocity blasts step（1）In broken heavy-metal contaminated soil
To pollution-free soil and foam containing heavy metal, wherein the flow velocity of reversible surfactant foam is 100 mL/min；
（5）Air is passed through step（4）In gained foam containing heavy metal, stand, lower floor's solid is reversible surfactant；Its
The flow velocity of middle air is 5mL/min；
Heavy metal chromium after contaminated soil remediation obtained by the present embodiment, every, the mass percent content of lead, copper be the mg/ of chromium 49.9
Kg, every 19.7 mg/kg, the mg/kg of lead 279.8, the mg/kg of copper 22.9, be computed, heavy metal chromium, every, the clearance point of lead, copper
Wei 82.1%, 79.3%, 87.2%, 72.1%；Reversible surfactant（2- dodecyl -1- hydroxyethyl imidazole quinolines）The rate of recovery
For 82.3%.
Claims (7)
1. a kind of restorative procedure of heavy-metal contaminated soil, it is characterised in that concretely comprise the following steps：
（1）Heavy-metal contaminated soil is crushed to particle diameter and is not more than 50 mm；
（2）Reversible surfactant is added to the water, carbon dioxide is then passed to and obtains reversible surfactant carbonate water
Solution；
（3）By step（2）The reversible surfactant carbonate aqueous solution of gained, the chelating agent aqueous solution, CO2Gas each leads into more
Reversible surfactant foam is obtained in the medium of hole；
（4）By step（3）The reversible surfactant foam of gained at the uniform velocity blasts step（1）In broken heavy-metal contaminated soil
To pollution-free soil and the foam containing heavy metal；
（5）Air or inert gas are passed through step（4）In gained foam containing heavy metal, stand, lower floor's solid is reversible table
Face activating agent.
2. the restorative procedure of heavy-metal contaminated soil according to claim 1, it is characterised in that：Step（2）In reversible surface
Activating agent be containing amidino groups, guanidine radicals, imidazoline functional groups chain alkyl (R=C8~C18) one or more in compound.
3. the restorative procedure of heavy-metal contaminated soil according to claim 1, it is characterised in that：Step（2）In reversible surface
The mass percent concentration of reversible surfactant is 0.1 ~ 2% in activating agent carbonate aqueous solution.
4. the restorative procedure of heavy-metal contaminated soil according to claim 1, it is characterised in that：Step（3）Middle chelating agent water
The mass percent concentration of chelating agent is 1 ~ 5% in solution, and chelating agent is ethylenediamine tetra-acetic acid, diethyl pentetic acid, second two
One or more in alcohol double tetraacethyl, rhamnose, saponin, oxalic acid, citric acid, salicylic acids.
5. the restorative procedure of heavy-metal contaminated soil according to claim 1, it is characterised in that：Step（3）Middle porous media
Porosity be not less than 3%, particle diameter is 0.05 ~ 50 mm.
6. the restorative procedure of heavy-metal contaminated soil according to claim 1, it is characterised in that：Step（3）In reversible surface
Activating agent carbonate aqueous solution, CO2Gas, the velocity ratio of the chelating agent aqueous solution are 1:(0.02~0.5):(0.05~0.8).
7. the restorative procedure of heavy-metal contaminated soil according to claim 1, it is characterised in that：Step（4）In reversible surface
The flow velocity of activating agent foam is 0.02 ~ 100 mL/min.
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