CN108994061A - A kind of soil-repairing agent and soil remediation method - Google Patents
A kind of soil-repairing agent and soil remediation method Download PDFInfo
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- CN108994061A CN108994061A CN201811075021.4A CN201811075021A CN108994061A CN 108994061 A CN108994061 A CN 108994061A CN 201811075021 A CN201811075021 A CN 201811075021A CN 108994061 A CN108994061 A CN 108994061A
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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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention provides a kind of soil-repairing agent and soil remediation methods, design technical field of soil remediation.Soil-repairing agent of the invention, chelating agent, the surfactant of 12-29 parts by weight, the organic solvent of 19-33 parts by weight, the alkyl glycosides of 3-5 parts by weight and 3-5 part by weight of metal salt including 35-62 parts by weight.Soil remediation method includes the following steps: to obtain soil to be treated, is crushed, is ground, and adjusts the pH value of the soil；Obtain soil-repairing agent；Configured soil-repairing agent and soil are repeatedly eluted according to preset ratio；Soil after the completion of elution is divulged information, is heated.Using soil-repairing agent and soil remediation method of the invention can it is more with the type of the pollutant in rehabilitating soil, repairing efficiency is short, the plenty of time can be saved；Repairing effect is good, to the removal efficiencies of the multiple pollutants such as cadmium, nitrobenzene all 98% or more；Effect on environment is small.
Description
Technical field
The present invention relates to technical field of soil remediation, more particularly to a kind of soil-repairing agent and soil remediation method.
Background technique
Soil pollution refers to the self-purification capacity for exceeding soil into the nocuousness in soil, noxious material, leads to the object of soil
The phenomenon that reason, chemistry and biology property change, reduce the yield and quality of crops, and be detrimental to health.Soil
Pollution makes geobiont population change, and directly affects the structure and function of soil ecosystem, production capacity is caused to be degenerated,
The food chain of " soil-plant-animal-human body " finally constitutes a threat to ecological safety and human life and health.Slowly due to it
Property and concealment, therefore be referred to as " invisible pollution ".
Soil pollutant is broadly divided into inorganic pollution and organic pollutant two major classes.Inorganic pollution mainly includes
Acid, alkali, heavy metal, salt, radioactive element caesium, the compound of strontium, containing arsenic, selenium, compound of fluorine etc..Organic pollutant is main
Including organic agricultural chemicals, phenols, cyanide, petroleum, synthetic detergent, 3,4- BaP and by municipal sewage, sludge and barnyard manure
Bring harmful microorganism etc..
Soil leaching technology, which refers to, injects polluted soil for the chemical solvent that can promote soil pollutant dissolution or migration
In, it is a kind of to be repaired using the principles of chemistry thus the technology that pollutant is dissolved from soil, separates and handled
The common technology of contaminated soil.Its mechanism of action is using leacheate or chemical assistant in conjunction with the pollutant in soil, and
By chemical actions such as the desorption of leacheate, chelating, dissolution or fixations, achieve the purpose that repairing polluted soil.
Soil washing can be divided into original position soil elution and dystopy Soil leaching by the position of processing soil.
Original position soil elution refers to by injector well etc. to soil apply eluent, permeate it downwards, pass through contaminated zone with
The effects of pollutant combines, and by desorption, dissolution or is complexed, ultimately forms transportable state compound.Solution containing pollutant
It can be collected, be stored with the modes such as well are extracted, further handled, to be re-used for processing contaminated soil.
Dystopy Soil leaching, which refers to, excavates contaminated soil, removes the component of super large by screening and soil is divided into slightly
Then material and fines are cleaned with eluent, removes pollutant, reprocess the leachates containing pollutant, and by the soil of cleaning
Earth backfills or transports to other places.
Existing recovery technique is more single in the presence of removal pollutant kind at present, repair time is longer, stablizing effect is not strong,
The problems such as influencing soil property, therefore develop a kind of rationally effective soil remediation processing method and be particularly important.
Summary of the invention
It is an object of the present invention to provide a kind of soil-repairing agent, it is single to solve existing removal pollutant kind
Problem.
Another object of the present invention is the soil remediation time length for solving existing soil-repairing agent, stablizing effect difference
Problem.
A further object of the present invention is to provide a kind of comprehensive pollution efficient, multi-functional, the period is short, effect on environment is small
Soil restoring technology method.
Particularly, the present invention provides a kind of soil-repairing agent, comprising:
The chelating agent of 35-62 parts by weight, the surfactant of 12-29 parts by weight, 19-33 parts by weight organic solvent, 3-5
The alkyl glycosides and 3-5 part by weight of metal salt of parts by weight.
Optionally, the chelating agent is selected from EDTA, EDTA-Na2, one or more of HEDTA, NTA, EGTA, CDTA.
Optionally, the surfactant is anionic surfactant, selected from one of SDS, LAS, SLS, AES or
It is several.
Optionally, the organic solvent is one or both of ethyl alcohol and ethyl acetate.
Optionally, the metallic salt is selected from one or more of calcium chloride, magnesium chloride, sodium chloride, calgon.
Particularly, the present invention also provides a kind of soil remediation sides using soil-repairing agent rehabilitating soil recited above
Method includes the following steps:
Soil to be treated is obtained, is crushed, ground, and adjusts the pH value of the soil；
Water is added into the soil-repairing agent and is configured to soil-repairing agent aqueous solution；
The configured soil-repairing agent aqueous solution and soil are repeatedly eluted according to preset ratio；
Soil after the completion of elution is divulged information, is heated, the soil repaired is obtained.
Optionally, the pH value of the soil is adjusted to 5-7.
Optionally, the concentration of chelating agent described in the soil-repairing agent aqueous solution is 0.04-0.06mol/L.
Optionally, it is 1:10-15 that the preset ratio, which is the solid-to-liquid ratio of the soil and the soil-repairing agent,.
Optionally, elution number is 1-3 times.
Soil-repairing agent and soil remediation method of the invention has the following advantages:
1. it is more to repair type, the soil of various heavy and organic pollution can be repaired simultaneously；
2. repairing efficiency is short, the contaminated soil remediation for meeting national requirements is can be completed in 3 days most fast, most 7 days slow (one week)
Process can save the plenty of time compared to the soil remediation method that reparation, phytoremediation etc. take a long time is solidified；
3. repairing effect is good, to the removal efficiencies of the multiple pollutants such as cadmium, nitrobenzene all 98% or more；
4. effect on environment is small, what is used is less toxic innocuous substance, reduces the secondary dirt to soil and surrounding enviroment
Dye.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
Some specific embodiments of the present invention is described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter.
Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that these
What attached drawing was not necessarily drawn to scale.In attached drawing:
Fig. 1 is the schematic block diagram of soil remediation method accord to a specific embodiment of that present invention.
Specific embodiment
As a specifically embodiment, soil-repairing agent of the invention may include: 35-62 parts by weight chelating agent,
The surfactant of 12-29 parts by weight, the organic solvent of 19-33 parts by weight, 3-5 parts by weight alkyl glycosides and 3-5 parts by weight
Metallic salt.
Specifically, the chelating agent is selected from EDTA, EDTA-Na2, one or more of HEDTA, NTA, EGTA, CDTA.
The chelating agent can in conjunction with the heavy metal ion in the soil liquid, to change the existing forms of heavy metal in the soil,
So that heavy metal is converted into soluble state by not solvent, all has very to most of heavy metal (especially for Pb, Cd, Cu and Zn)
Strong complexing power, while a plurality of types of soil can be handled.
Specifically, the embodiment of the present invention surfactant is anionic surfactant, is selected from SDS, LAS, SLS, AES
One or more of.Anionic surfactant mechanism of action is the surface nature by change soil or is adsorbed onto soil
Grain surface occurs complex reaction using ion exchange or with metal ion, makes metal transfer into the soil liquid.Together
When, the amphiprotic group of activating agent is crispaturaed and solubilization, can promote the removing of hydrophobic organic pollutant in soil.
Specifically, the organic solvent is one or both of ethyl alcohol and ethyl acetate.It mixes and reduces according to similar
The principles such as surface tension, organic solvent have certain soil washing to the Some Organic Pollutants matter such as DDT, dioxin, PCDFs.
Specifically, alkyl glycosides (APG) not only has table with the property of two kinds of surfactants of nonionic and anion
The solubilized mobilization of face activating agent, and can be used as the adjuvant of surfactant, it can be risen with surfactant compound
To synergistic effect；
Specifically, the metallic salt is selected from one or more of calcium chloride, magnesium chloride, sodium chloride, calgon.
Metallic salt itself can dissolve heavy metal by ion-exchange reactions, or improve its dissolution in the solution by complex reaction
Property.Also, surfactant can be enhanced to the solubilized flow increasing effect of hydrophobic organic pollutant in salt, improves elution efficiency.
Fig. 1 is the schematic block diagram of soil remediation method accord to a specific embodiment of that present invention.As of the invention
One specifically embodiment, present embodiment discloses the soil remediation sides for using soil-repairing agent rehabilitating soil recited above
Method may include steps of:
S10 obtains soil to be treated, is crushed, is ground, and adjusts the pH value of the soil；
Water is added into the soil-repairing agent and is configured to soil-repairing agent aqueous solution by S20；
S30 is repeatedly eluted the configured soil-repairing agent and soil according to preset ratio；
Soil after the completion of elution is divulged information, is heated by S40, obtains the soil repaired.
Wherein, the pH value of the soil is adjusted to 5-7.The concentration of chelating agent described in the soil-repairing agent aqueous solution is
0.04-0.06mol/L.The preset ratio is that the solid-to-liquid ratio of the soil and the soil-repairing agent is 1:10-15.Elution time
Number is 1-3 times.Certainly, elution number can carry out adjustment appropriate according to the efficiency actually eluted, if elution effect is bad
Elution number can suitably be increased.
Preferably, in the present embodiment, the leacheate after use can be repeated back to by modes such as chemicals treatment, activated carbon adsorptions
It receives and utilizes.
The invention has the following advantages that
1, it is more to repair type, the soil of various heavy and organic pollution can be repaired simultaneously；
2, repairing efficiency is short, and the contaminated soil remediation for meeting national requirements can be completed in 3 days most fast, most 7 days slow (one week)
Process can save the plenty of time compared to the soil remediation method that reparation, phytoremediation etc. take a long time is solidified；
3, repairing effect is good, to the removal efficiencies of the multiple pollutants such as cadmium, nitrobenzene all 98% or more；
4, effect on environment is small, and what is used is less toxic innocuous substance, reduces the secondary dirt to soil and surrounding enviroment
Dye.
Embodiment 1
1, the contaminated soil that pH value is 8 is excavated into transport to the dedicated place of soil remediation；
2, contaminated soil is crushed, grinds soil particle, adjust pH to 7；
3, soil and medicament solid-to-liquid ratio 1:10 configure medicament, configure the chelating agent of 0.05mol/L；
4, it mixes following substance according to following percentage according to chelating agent additional amount and is added to the water and stir evenly: EDTA
40%, LAS 26%, ethyl alcohol 26%, APG 3%, NaCl 5%；
5,3 contaminated soils are eluted with liquid medicine；
6, it with a large amount of water washeds off soil, then divulged information, heated again, the soil repaired can be obtained.Chromium after reparation,
The pollutants removal rates such as lead, cadmium, diesel oil, nitrobenzene reach 94% or more, other pollutant available state amounts also have different degrees of
It reduces, reaches the requirement of Chinese " standard of soil environment quality " (GB15618-1995) secondary standard.
Embodiment 2
1, the contaminated soil that pH value is 10 is excavated into transport to the dedicated place of soil remediation；
2, contaminated soil is crushed, grinds soil particle, adjust pH to 6.5；
3, soil and medicament solid-to-liquid ratio 1:10 configure medicament, configure the chelating agent of 0.05mol/L；
4, it mixes following substance according to following percentage according to chelating agent additional amount and is added to the water and stir evenly: EDTA
50%, LAS 24%, ethyl alcohol 20%, APG 3%, MgCl23%；
5,2 contaminated soils are eluted with liquid medicine；
6, it with a large amount of water washeds off soil, then divulged information, heated again, the soil repaired can be obtained.Chromium after reparation,
The pollutants removal rates such as lead, cadmium, diesel oil, nitrobenzene reach 91% or more, other pollutant available state amounts also have different degrees of
It reduces, reaches the requirement of Chinese " standard of soil environment quality " (GB15618-1995) secondary standard.
Embodiment 3
1, the contaminated soil that pH value is 5 is excavated into transport to the dedicated place of soil remediation；
2, contaminated soil is crushed, grinds soil particle；
3, soil and medicament solid-to-liquid ratio 1:12 configure medicament, configure the chelating agent of 0.06mol/L；
4, it mixes following substance according to following percentage according to chelating agent additional amount and is added to the water and stir evenly: EDTA
60%, LAS 11%, SDS 3%, ethyl alcohol 19%, APG 4%, NaCl 3%；
5,1 contaminated soil is eluted with liquid medicine；
6, it with a large amount of water washeds off soil, then divulged information, heated again, the soil repaired can be obtained.Chromium after reparation,
The pollutants removal rates such as lead, cadmium, diesel oil, nitrobenzene reach 90% or more, other pollutant available state amounts also have different degrees of
It reduces, reaches the requirement of Chinese " standard of soil environment quality " (GB15618-1995) secondary standard.
Embodiment 4
1, the contaminated soil that pH value is 12 is excavated into transport to the dedicated place of soil remediation；
2, contaminated soil is crushed, grinds soil particle, adjust pH to 5.5；
3, soil and medicament solid-to-liquid ratio 1:10 configure medicament, configure the chelating agent of 0.04mol/L；
4, it mixes following substance according to following percentage according to chelating agent additional amount and is added to the water and stir evenly: EDTA-
Na255%, SDS 18%, ethyl alcohol 14%, ethyl acetate 5%, APG 4%, calgon 4%；
5,3 contaminated soils are eluted with liquid medicine；
6, it with a large amount of water washeds off soil, then divulged information, heated again, the soil repaired can be obtained.Chromium after reparation,
The pollutants removal rates such as lead, cadmium, diesel oil, nitrobenzene reach 94% or more, other pollutant available state amounts also have different degrees of
It reduces, reaches the requirement of Chinese " standard of soil environment quality " (GB15618-1995) secondary standard.
Embodiment 5
1, the contaminated soil that pH value is 7 is excavated into transport to the dedicated place of soil remediation；
2, contaminated soil is crushed, grinds soil particle；
3, soil and medicament solid-to-liquid ratio 1:10 configure medicament, configure the chelating agent of 0.05mol/L；
4, it mixes following substance according to following percentage according to chelating agent additional amount and is added to the water and stir evenly: EDTA-
Na235%, SDS 28%, ethyl alcohol 15%, ethyl acetate 12%, APG 5%, calgon 5%；
5,3 contaminated soils are eluted with liquid medicine；
6, it with a large amount of water washeds off soil, then divulged information, heated again, the soil repaired can be obtained.Chromium after reparation,
The pollutants removal rates such as lead, cadmium, diesel oil, nitrobenzene reach 90% or more, other pollutant available state amounts also have different degrees of
It reduces, reaches the requirement of Chinese " standard of soil environment quality " (GB15618-1995) secondary standard.
Embodiment 6
1, the contaminated soil that pH value is 6 is excavated into transport to the dedicated place of soil remediation；
2, contaminated soil is crushed, grinds soil particle；
3, soil and medicament solid-to-liquid ratio 1:15 configure medicament, configure the chelating agent of 0.04mol/L；
4, it mixes following substance according to following percentage according to chelating agent additional amount and is added to the water and stir evenly: EDTA-
Na248%, SDS 25%, ethyl acetate 20%, APG 3%, NaCl 2%, calgon 2%；
5,2 contaminated soils are eluted with liquid medicine；
6, it with a large amount of water washeds off soil, then divulged information, heated again, the soil repaired can be obtained.Chromium after reparation,
The pollutants removal rates such as lead, cadmium, diesel oil, nitrobenzene reach 92% or more, other pollutant available state amounts also have different degrees of
It reduces, reaches the requirement of Chinese " standard of soil environment quality " (GB15618-1995) secondary standard.
So far, although those skilled in the art will appreciate that present invention has been shown and described in detail herein multiple shows
Example property embodiment still without departing from the spirit and scope of the present invention, still can according to the present disclosure directly
Determine or deduce out many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and recognizes
It is set to and covers all such other variations or modifications.
Claims (10)
1. a kind of soil-repairing agent characterized by comprising
The chelating agent of 35-62 parts by weight, the surfactant of 12-29 parts by weight, the organic solvent of 19-33 parts by weight, 3-5 weight
The alkyl glycosides and 3-5 part by weight of metal salt of part.
2. soil-repairing agent according to claim 1, which is characterized in that
The chelating agent is selected from EDTA, EDTA-Na2, one or more of HEDTA, NTA, EGTA, CDTA.
3. soil-repairing agent according to claim 1, which is characterized in that
The surfactant is anionic surfactant, selected from one or more of SDS, LAS, SLS, AES.
4. soil-repairing agent according to claim 1, which is characterized in that
The organic solvent is one or both of ethyl alcohol and ethyl acetate.
5. soil-repairing agent according to claim 1, which is characterized in that
The metallic salt is selected from one or more of calcium chloride, magnesium chloride, sodium chloride, calgon.
6. a kind of soil remediation method using the soil-repairing agent rehabilitating soil of any of claims 1-5, special
Sign is, includes the following steps:
Soil to be treated is obtained, is crushed, ground, and adjusts the pH value of the soil；
Water is added into the soil-repairing agent and is configured to soil-repairing agent aqueous solution；
The configured soil-repairing agent aqueous solution and soil are repeatedly eluted according to preset ratio；
Soil after the completion of elution is divulged information, is heated, the soil repaired is obtained.
7. soil remediation method according to claim 6, which is characterized in that
The pH value of the soil is adjusted to 5-7.
8. soil remediation method according to claim 6, which is characterized in that
The concentration of chelating agent described in the soil-repairing agent aqueous solution is 0.04-0.06mol/L.
9. soil remediation method according to claim 6, which is characterized in that
The preset ratio is that the solid-to-liquid ratio of the soil and the soil-repairing agent is 1:10-15.
10. soil remediation method according to claim 6, which is characterized in that
Eluting number is 1-3 times.
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| CN110153158A (en) * | 2019-05-27 | 2019-08-23 | 江苏雨松环境修复研究中心有限公司 | A kind of reparation medicament and restorative procedure for heavy-metal contaminated soil |
| CN110201998A (en) * | 2019-06-05 | 2019-09-06 | 上海大学 | A kind of method that sudangrass repairs pyrene and nickel combined contamination soil |
| CN112280560A (en) * | 2020-09-28 | 2021-01-29 | 广东省环境科学研究院 | Composite eluting agent and method for eluting soil organic pollutants |
| NL2026659A (en) | 2019-10-17 | 2021-06-07 | Univ Xian Shiyou | Plant growth medium based on residue from high temperature thermal oxidation of oily solid wase |
| CN113652237A (en) * | 2021-06-24 | 2021-11-16 | 天津华勘环保科技有限公司 | Green eluting agent for heavy metal/organic matter composite contaminated soil remediation and use method thereof |
| CN114085676A (en) * | 2021-11-30 | 2022-02-25 | 中国原子能科学研究院 | Radioactive contaminated soil cleaning agent composition, cleaning agent, preparation method and application thereof |
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