CN112893442A - Remediation method for heavy metal contaminated soil - Google Patents
Remediation method for heavy metal contaminated soil Download PDFInfo
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- CN112893442A CN112893442A CN202110072166.4A CN202110072166A CN112893442A CN 112893442 A CN112893442 A CN 112893442A CN 202110072166 A CN202110072166 A CN 202110072166A CN 112893442 A CN112893442 A CN 112893442A
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- 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
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- 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
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Abstract
The invention discloses a remediation method for heavy metal contaminated soil, which comprises the following steps: digging out soil on the surface layer of the heavy metal polluted soil of each detection point by using an excavator, crushing and screening the dug soil, and screening out large-particle garbage in the soil; the remediation agent, the reversible surfactant foam and the metal ion removal agent are added into the soil polluted by heavy metal, so that the concentration of the residual heavy metal in the soil can be effectively reduced, the removal rate of each heavy metal ion is very high, copper ions and mercury ions can be almost completely removed, the removal rate of lead ions and cadmium ions is also higher, the remediation effect is good, the sewage collected at a lower position is reused for spraying after electric flocculation purification, the surfactant is naturally degraded within a plurality of weeks, and no chemical residue or secondary pollution exists.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a remediation method for heavy metal contaminated soil.
Background
With the upgrading of industrial structures and the adjustment of urban layout in China, a lot of cities emerge the phenomena of closing and moving of a large number of polluted enterprises, so that a large number of industrial polluted sites are left in the cities, wherein heavy metal polluted soil is a common type in the industrial polluted sites. Most of the polluted sites are subjected to land type change due to reutilization, and the harm of heavy metals to animals, plants and human bodies has long-term property, potential property and irreversibility, so that the corresponding repair is carried out before the polluted soil is reused to ensure the site environment and the health of residents.
The existing heavy metal contaminated soil remediation mainly comprises the technical methods of abandoned land, removed soil, nursery stock planting, chemical regulation, microbial remediation and the like, but the methods have long period, high input cost and poor operability, and therefore, the remediation method for the heavy metal contaminated soil is provided.
Disclosure of Invention
The invention aims to provide a remediation method for heavy metal contaminated soil, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a remediation method for heavy metal contaminated soil comprising the steps of:
digging out soil on the surface layer of the heavy metal polluted soil of each detection point by using an excavator, crushing and screening the dug soil, and screening out large-particle garbage in the soil;
step two, preparing a reversible surfactant carbonate aqueous solution;
step three, preparing reversible surfactant foam;
step four, preparing a metal ion removal agent;
adding a repairing agent, reversible surfactant foam and a metal ion removing agent into the soil, and turning over the soil through a digging machine to uniformly mix the soil and the repairing agent;
step six, spraying soil;
step seven, spraying sewage treatment;
step eight, determining the content of part of heavy metal ions in the treated soil;
and step nine, planting one or more of green plants such as scindapsus aureus, ivy, sansevieria trifasciata and the like on the treated soil.
As further preferable in the present technical solution: in the second step, the reversible surfactant carbonate aqueous solution is obtained by adding the reversible surfactant into water and then introducing carbon dioxide.
As further preferable in the present technical solution: in the third step, reversible surfactant carbonate aqueous solution, chelating agent aqueous solution and CO2 gas are respectively introduced into the porous medium to obtain reversible surfactant foam.
As further preferable in the present technical solution: in the fourth step, hydroxyethyl oleic imidazoline betaine, polyethylene glycol, phosphatidylethanolamine, coconut monoethanolamide and deionized water are mixed and stirred, ethylene diamine tetraacetic acid, sodium hydroxide, starch xanthate and water are added for stirring, filtering is carried out, filtrate is removed, peanut shell powder, banana peel powder, straw powder, salicylic acid, sodium alginate and water are added for stirring, filtering is carried out, filtrate is removed, and therefore the metal ion removal agent is obtained.
As further preferable in the present technical solution: in the fifth step, the repairing agent comprises the following components in parts by weight: 35-50 parts of clam shell powder, 8-22 parts of organic fertilizer, 5-25 parts of bone meal and 1-3 parts of compound microbial agent.
As further preferable in the present technical solution: and in the sixth step, water is sprayed on the polluted soil, water, acid and biodegradable surfactant are added, the water flows through the soil from the surface, and heavy metal ions are dissolved in the water through heating, ploughing and shaking, so that the concentration of the residual heavy metal in the soil is reduced.
As further preferable in the present technical solution: in the seventh step, the sewage collected at the lower position is reused as spraying after electric flocculation purification.
As further preferable in the present technical solution: the surfactant degrades naturally within weeks.
Compared with the prior art, the invention has the beneficial effects that: the remediation method has the advantages that the remediation agent, reversible surfactant foam and metal ion removal agent are added into the soil polluted by heavy metal, the concentration of the heavy metal remaining in the soil can be effectively reduced, the removal rate of each heavy metal ion is very high, copper ions and mercury ions can be almost completely removed, the removal rate of lead ions and cadmium ions is also high, the remediation effect is good, the sewage collected at a lower position is reused for spraying after electric flocculation purification, the surfactant is naturally degraded within a plurality of weeks, and no chemical residue or secondary pollution exists.
Drawings
FIG. 1 is a flow chart of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, the present invention provides a technical solution: a remediation method for heavy metal contaminated soil comprising the steps of:
digging out soil on the surface layer of the heavy metal polluted soil of each detection point by using an excavator, crushing and screening the dug soil, and screening out large-particle garbage in the soil;
step two, preparing a reversible surfactant carbonate aqueous solution;
step three, preparing reversible surfactant foam;
step four, preparing a metal ion removal agent;
adding a repairing agent, reversible surfactant foam and a metal ion removing agent into the soil, and turning over the soil through a digging machine to uniformly mix the soil and the repairing agent;
step six, spraying soil;
step seven, spraying sewage treatment;
step eight, determining the content of part of heavy metal ions in the treated soil;
and step nine, planting the scindapsus aureus in the treated soil.
In this embodiment, specifically: in the second step, the reversible surfactant carbonate aqueous solution is obtained by adding the reversible surfactant into water and then introducing carbon dioxide.
In this embodiment, specifically: in step threeBy mixing an aqueous solution of a reversible surfactant carbonate, an aqueous solution of a chelating agent, and CO2And respectively introducing gas into the porous medium to obtain the reversible surfactant foam.
In this embodiment, specifically: in the fourth step, hydroxyethyl oleic imidazoline betaine, polyethylene glycol, phosphatidylethanolamine, coconut monoethanolamide and deionized water are mixed and stirred, ethylene diamine tetraacetic acid, sodium hydroxide, starch xanthate and water are added for stirring, filtering is carried out, filtrate is removed, peanut shell powder, banana peel powder, straw powder, salicylic acid, sodium alginate and water are added for stirring, filtering is carried out, filtrate is removed, and therefore the metal ion removal agent is obtained.
In this embodiment, specifically: in the fifth step, the repairing agent comprises the following components in parts by weight: 35 parts of clam shell powder, 10 parts of organic fertilizer, 8 parts of bone meal and 12 parts of compound microbial agent.
In this embodiment, specifically: and in the sixth step, spraying water onto the polluted soil, adding water, acid and a biodegradable surfactant, enabling the water to flow through the soil from the surface, and dissolving heavy metal ions in the water through heating, ploughing and shaking to reduce the concentration of the residual heavy metal in the soil.
In this embodiment, specifically: in the seventh step, the sewage collected at the lower position is reused as spraying after electric flocculation purification.
In this embodiment, specifically: the surfactant is naturally degraded in a plurality of weeks without chemical residues or secondary pollution.
Example two
Referring to fig. 1, the present invention provides a technical solution: a remediation method for heavy metal contaminated soil comprising the steps of:
digging out soil on the surface layer of the heavy metal polluted soil of each detection point by using an excavator, crushing and screening the dug soil, and screening out large-particle garbage in the soil;
step two, preparing a reversible surfactant carbonate aqueous solution;
step three, preparing reversible surfactant foam;
step four, preparing a metal ion removal agent;
adding a repairing agent, reversible surfactant foam and a metal ion removing agent into the soil, and turning over the soil through a digging machine to uniformly mix the soil and the repairing agent;
step six, spraying soil;
step seven, spraying sewage treatment;
step eight, determining the content of part of heavy metal ions in the treated soil;
and step nine, planting ivy on the treated soil.
In this embodiment, specifically: in the second step, the reversible surfactant carbonate aqueous solution is obtained by adding the reversible surfactant into water and then introducing carbon dioxide.
In this embodiment, specifically: in the third step, the reversible surfactant carbonate aqueous solution, the chelating agent aqueous solution and CO are added2And respectively introducing gas into the porous medium to obtain the reversible surfactant foam.
In this embodiment, specifically: in the fourth step, hydroxyethyl oleic imidazoline betaine, polyethylene glycol, phosphatidylethanolamine, coconut monoethanolamide and deionized water are mixed and stirred, ethylene diamine tetraacetic acid, sodium hydroxide, starch xanthate and water are added for stirring, filtering is carried out, filtrate is removed, peanut shell powder, banana peel powder, straw powder, salicylic acid, sodium alginate and water are added for stirring, filtering is carried out, filtrate is removed, and therefore the metal ion removal agent is obtained.
In this embodiment, specifically: in the fifth step, the repairing agent comprises the following components in parts by weight: 45 parts of clam shell powder, 15 parts of organic fertilizer, 15 parts of bone meal and 1 part of compound microbial agent.
In this embodiment, specifically: and in the sixth step, spraying water onto the polluted soil, adding water, acid and a biodegradable surfactant, enabling the water to flow through the soil from the surface, and dissolving heavy metal ions in the water through heating, ploughing and shaking to reduce the concentration of the residual heavy metal in the soil.
In this embodiment, specifically: in the seventh step, the sewage collected at the lower position is reused as spraying after electric flocculation purification.
In this embodiment, specifically: the surfactant is naturally degraded in a plurality of weeks without chemical residues or secondary pollution.
EXAMPLE III
Referring to fig. 1, the present invention provides a technical solution: a remediation method for heavy metal contaminated soil comprising the steps of:
digging out soil on the surface layer of the heavy metal polluted soil of each detection point by using an excavator, crushing and screening the dug soil, and screening out large-particle garbage in the soil;
step two, preparing a reversible surfactant carbonate aqueous solution;
step three, preparing reversible surfactant foam;
step four, preparing a metal ion removal agent;
adding a repairing agent, reversible surfactant foam and a metal ion removing agent into the soil, and turning over the soil through a digging machine to uniformly mix the soil and the repairing agent;
step six, spraying soil;
step seven, spraying sewage treatment;
step eight, determining the content of part of heavy metal ions in the treated soil;
and step nine, planting sansevieria trifasciata in the treated soil.
In this embodiment, specifically: in the second step, the reversible surfactant carbonate aqueous solution is obtained by adding the reversible surfactant into water and then introducing carbon dioxide.
In this embodiment, specifically: in the third step, the reversible surfactant carbonate aqueous solution, the chelating agent aqueous solution and CO are added2And respectively introducing gas into the porous medium to obtain the reversible surfactant foam.
In this embodiment, specifically: in the fourth step, hydroxyethyl oleic imidazoline betaine, polyethylene glycol, phosphatidylethanolamine, coconut monoethanolamide and deionized water are mixed and stirred, ethylene diamine tetraacetic acid, sodium hydroxide, starch xanthate and water are added for stirring, filtering is carried out, filtrate is removed, peanut shell powder, banana peel powder, straw powder, salicylic acid, sodium alginate and water are added for stirring, filtering is carried out, filtrate is removed, and therefore the metal ion removal agent is obtained.
In this embodiment, specifically: in the fifth step, the repairing agent comprises the following components in parts by weight: 50 parts of clam shell powder, 20 parts of organic fertilizer, 20 parts of bone meal and 2 parts of compound microbial agent.
In this embodiment, specifically: and in the sixth step, spraying water onto the polluted soil, adding water, acid and a biodegradable surfactant, enabling the water to flow through the soil from the surface, and dissolving heavy metal ions in the water through heating, ploughing and shaking to reduce the concentration of the residual heavy metal in the soil.
In this embodiment, specifically: in the seventh step, the sewage collected at the lower position is reused as spraying after electric flocculation purification.
In this embodiment, specifically: the surfactant is naturally degraded in a plurality of weeks without chemical residues or secondary pollution.
The working principle or the structure principle is that when the device is used, an excavator is used for digging out soil on the surface layer of the heavy metal polluted soil at each detection point, the dug soil is crushed and screened, large-particle garbage in the soil is screened out, a reversible surfactant is added into water, then carbon dioxide is introduced to obtain a reversible surfactant carbonate aqueous solution, and the reversible surfactant carbonate aqueous solution, a chelating agent aqueous solution and CO are mixed to obtain the reversible surfactant carbonate aqueous solution2Respectively introducing gas into porous medium to obtain reversible surfactant foam, mixing hydroxyethyl oleic acid imidazoline betaine, polyethylene glycol, phosphatidyl ethanolamine, coconut oil acid monoethanolamide and deionized water, stirring, adding ethylenediamine tetraacetic acid, sodium hydroxide, starch xanthate and water, stirring, filtering, removing filtrate, adding peanut shell powder, banana peel powder, straw powder, salicylic acid, sodium alginate and water, and stirringFiltering, removing filtrate to obtain a metal ion removal agent, adding a repairing agent, reversible surfactant foam and the metal ion removal agent into soil, stirring the soil by an excavator to uniformly mix the soil and the repairing agent, spraying water onto the polluted soil, adding water, acid and a biodegradable surfactant, allowing the water to flow through the soil from the surface, heating, ploughing and vibrating to dissolve heavy metal ions in the water, reducing the concentration of the residual heavy metal in the soil, purifying the sewage collected at a lower position by electric flocculation, spraying again, measuring the content of part of the heavy metal ions in the treated soil, and planting green plants on the treated soil.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A remediation method for heavy metal contaminated soil, comprising the steps of:
digging out soil on the surface layer of the heavy metal polluted soil of each detection point by using an excavator, crushing and screening the dug soil, and screening out large-particle garbage in the soil;
step two, preparing a reversible surfactant carbonate aqueous solution;
step three, preparing reversible surfactant foam;
step four, preparing a metal ion removal agent;
adding a repairing agent, reversible surfactant foam and a metal ion removing agent into the soil, and turning over the soil through a digging machine to uniformly mix the soil and the repairing agent;
step six, spraying soil;
step seven, spraying sewage treatment;
step eight, determining the content of part of heavy metal ions in the treated soil;
and step nine, planting one or more of green plants such as scindapsus aureus, ivy, sansevieria trifasciata and the like on the treated soil.
2. The remediation method for heavy metal contaminated soil according to claim 1, wherein: in the second step, the reversible surfactant carbonate aqueous solution is obtained by adding the reversible surfactant into water and then introducing carbon dioxide.
3. The remediation method for heavy metal contaminated soil according to claim 1, wherein: in the third step, the reversible surfactant carbonate aqueous solution, the chelating agent aqueous solution and CO are added2And respectively introducing gas into the porous medium to obtain the reversible surfactant foam.
4. The remediation method for heavy metal contaminated soil according to claim 1, wherein: in the fourth step, hydroxyethyl oleic imidazoline betaine, polyethylene glycol, phosphatidylethanolamine, coconut monoethanolamide and deionized water are mixed and stirred, ethylene diamine tetraacetic acid, sodium hydroxide, starch xanthate and water are added for stirring, filtering is carried out, filtrate is removed, peanut shell powder, banana peel powder, straw powder, salicylic acid, sodium alginate and water are added for stirring, filtering is carried out, filtrate is removed, and therefore the metal ion removal agent is obtained.
5. The remediation method for heavy metal contaminated soil according to claim 1, wherein: in the fifth step, the repairing agent comprises the following components in parts by weight: 35-50 parts of clam shell powder, 8-22 parts of organic fertilizer, 5-25 parts of bone meal and 1-3 parts of compound microbial agent.
6. The remediation method for heavy metal contaminated soil according to claim 1, wherein: and in the sixth step, water is sprayed on the polluted soil, water, acid and biodegradable surfactant are added, the water flows through the soil from the surface, and heavy metal ions are dissolved in the water through heating, ploughing and shaking, so that the concentration of the residual heavy metal in the soil is reduced.
7. The remediation method for heavy metal contaminated soil according to claim 1, wherein: in the seventh step, the sewage collected at the lower position is reused as spraying after electric flocculation purification.
8. The remediation method for heavy metal contaminated soil according to claim 6, wherein: the surfactant degrades naturally within weeks.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110072166.4A CN112893442A (en) | 2021-01-20 | 2021-01-20 | Remediation method for heavy metal contaminated soil |
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| CN202110072166.4A CN112893442A (en) | 2021-01-20 | 2021-01-20 | Remediation method for heavy metal contaminated soil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114149085A (en) * | 2021-12-14 | 2022-03-08 | 辽宁大学 | Method for strengthening scindapsus aureus to restore copper-polluted water body by using salicylic acid |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19513660A1 (en) * | 1995-04-09 | 1996-10-10 | Blz Geotechnik Gmbh | Fixing of heavy metals in soils and waste prods. |
| CN106238449A (en) * | 2016-08-30 | 2016-12-21 | 樊之雄 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN107470341A (en) * | 2017-07-26 | 2017-12-15 | 昆明理工大学 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN108655171A (en) * | 2018-04-19 | 2018-10-16 | 郭婷 | A kind of restorative procedure of heavy-metal contaminated soil |
| GB201910612D0 (en) * | 2019-05-08 | 2019-09-11 | Yiwu Wanju Electronics Co Ltd | an Agricultural heavy metal in soil removal device |
-
2021
- 2021-01-20 CN CN202110072166.4A patent/CN112893442A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19513660A1 (en) * | 1995-04-09 | 1996-10-10 | Blz Geotechnik Gmbh | Fixing of heavy metals in soils and waste prods. |
| CN106238449A (en) * | 2016-08-30 | 2016-12-21 | 樊之雄 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN107470341A (en) * | 2017-07-26 | 2017-12-15 | 昆明理工大学 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN108655171A (en) * | 2018-04-19 | 2018-10-16 | 郭婷 | A kind of restorative procedure of heavy-metal contaminated soil |
| GB201910612D0 (en) * | 2019-05-08 | 2019-09-11 | Yiwu Wanju Electronics Co Ltd | an Agricultural heavy metal in soil removal device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114149085A (en) * | 2021-12-14 | 2022-03-08 | 辽宁大学 | Method for strengthening scindapsus aureus to restore copper-polluted water body by using salicylic acid |
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