CN110076189A - Method for restoring heavy metal contaminated soil by chemical-microbial combined action - Google Patents
Method for restoring heavy metal contaminated soil by chemical-microbial combined action Download PDFInfo
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- CN110076189A CN110076189A CN201910329576.5A CN201910329576A CN110076189A CN 110076189 A CN110076189 A CN 110076189A CN 201910329576 A CN201910329576 A CN 201910329576A CN 110076189 A CN110076189 A CN 110076189A
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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
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
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- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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- Biomedical Technology (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
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- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for restoring heavy metal contaminated soil by a chemical-microbial combined action, which comprises the following steps: selecting an idle period, spraying an organic acid chemical repairing agent with the mass concentration of 1mol/L, wherein the spraying amount of the chemical repairing agent is 5-10m3Spraying bioremediation agent after 2-4h per mu, wherein the spraying amount of the bioremediation agent is 15-30m3Covering a film on an area with the outdoor temperature of less than 18 ℃ per mu, and covering a heat insulation material, and keeping the tightness for 10-30 days; after treatment, the exchangeable state of various heavy metals in the soil is greatly reduced, and the heavy metals are not absorbed by crops any more. The method can effectively solve the problem of long repair time of a bioremediation method, is environment-friendly, simple in process and easy to popularize.
Description
Technical field
The invention belongs to contaminated soil remediation Treatment process, are a kind of methods for reducing heavy metal in soil exchangeable species,
Especially a kind of chemistry-microbial association effect restoration of soil polluted by heavy metal method.
Background technique
Soil pollution is a global pollution problem, is directly related to the sound development of the mankind.Environmental protection in 2014
" the national Soil Pollution Investigation bulletin " of portion and Ministry of Land and Resources's joint publication shows: national arable soil point exceeding standard rate
Reach 19.4%, surrounding soil exceeded point in mining area accounts for 33.4%.Based on inorganic type, organic type takes second place pollution type, compound
Pollution specific gravity is smaller, and exceeded digit of inorganic pollution accounts for the 82.8% of all exceeded points, predominantly heavy metal pollution.
Heavy metal in soil accumulates to a certain extent, not only results in soil degradation, crop yield and quality decline, and
And can also by runoff, leaching loss contaminating action surface water and groundwater, deteriorate hydrological environment, and may directly poisonous plant or
It is detrimental to health by food chain approach.Currently, heavy metal pollution of soil recovery technique is studied in countries in the world extensively,
Obtain corresponding progress, including physical method, chemical method, bioanalysis etc..
Physical method is broadly divided into heat treating process, isolation method, soil moved in improve the original soil replacement method, casting landfill method and dilution method.But
Not the problem of no matter which kind of restorative procedure not can solve economic and practical and " secondary destruction ", " secondary pollution ".Chemistry
Method mainly has chemical fixation and soil leaching method etc..Chemically administer heavy-metal contaminated soil, regulation effect and
Expense is all moderate, and centering slight pollution soil is particularly suitable, and chemical remediation is the recovery technique carried out on soil in-situ, simply
It is easy, but be not a kind of permanent reclamation activities, because the method only change heavy metal in the soil existing for form, metallic element
It remains in soil, easy reactivation leads to " secondary pollution ".Therefore it is dirty heavy metal-polluted soil to be carried out in this method of practical application
When the improvement of dye, it is necessary to consider how the biological effectiveness variation of monitoring heavy metals in soil.Bioanalysis mainly includes planting
Three kinds of methods such as object reparation, microorganism remediation and animal reparation.Phytoremediation technology is that one kind is restrained oneself with plant and excess is rich
Based on the theory for collecting certain pollutant, using naturally growth or genetic engineering cultivate plant and its microorganism system coexists,
A kind of environmental improvement technology to clear the pollution off.It is lacked in the presence of administering that generality is weak, and application range is smaller and repairing efficiency is long etc.
Point.Microbial method is that have absorption, precipitating, oxidation and reduction etc. to heavy metal using the bioactivity of certain micro-organisms in soil
Heavy metal ion, is converted into less toxic product, to reduce the toxicity of heavy metal in soil by effect.Microorganism remediation is come
It says, in scientific research and laboratory level, repairing effect is preferable, is put into field condition, and disturbing factor is complicated, in fact it could happen that newly asks
Topic.Animal reparation method is the characteristic that can absorb heavy metal using certain animals (such as earthworm, muroid) in soil, to a certain degree
Upper reduction Heavy Metals in Contaminated Soils content, achievees the purpose that animal reparation heavy-metal contaminated soil.It can be seen that needing more
Big puts into explore the more advanced every technology and method effectively administered and repaired with more economic contaminated soil.
Summary of the invention
It is an object of the invention to be directed to existing heavy metal soil restoring technology problem, a kind of chemistry-microorganism connection is proposed
The method that restoration of soil polluted by heavy metal is used in cooperation, this method use the recovery technique of greenization, annual implementable improvement 1-2
It is secondary, no pollution is caused to environment, is operated at slack seasons, farming is not influenced, effectively declines the exchangeable species of heavy metal in soil,
Plant reduces the bioavailable row of heavy metal, and soil realizes safe utilization.
In order to achieve the above-mentioned object of the invention, specific technical solution is as follows:
A kind of method of chemistry-microbial association effect restoration of soil polluted by heavy metal, which comprises the steps of:
1) period in slack season is chosen, the organic acid chemical remediation agent of mass concentration 1mol/L, the spray flow of chemical remediation agent are sprayed
For 5-10m3/ mu；
2) bioremediation agents are sprayed after spraying 2-4h, the spray flow of bioremediation agents is 15-30m3/ mu；
3) after the completion of the spray of step 2:
It is greater than 18 DEG C of area to outdoor temperature, 0-2h is in upper soll layer overlay film after the completion of spray；
Area to outdoor temperature less than 18 DEG C, 0-2h is in upper soll layer overlay film after the completion of spray, and covers thermal insulation material；
4) it is kept for airtightness 10-30 days after the processing of step 3)；
5) closed film is opened, is sampled, heavy metal in soil exchangeable species are detected；
If 6) heavy metal in soil exchangeable species content reduces not up to 50% or more, repeat above 1) to 5) step.
It is currently preferred, the heavy-metal contaminated soil selection period in slack season is operated in step 1), the agriculture
Idle section is determined according to the crop time, main that outdoor temperature is selected to carry out at 5-35 DEG C.
It is currently preferred, the agent of organic acid chemical remediation described in step 1) be common oxalic acid, propionic acid, citric acid or
The substances such as person's malic acid.
It is currently preferred, the formula of bioremediation agents described in step 2 are as follows: yeast extract 0.1-1.0g/L, Na2SO4
0.1-0.5g/L、C3H5O3Na 0.1-1.0g/L, and the biomass for repairing heterotrophism anaerobe in liquid is greater than 1.0 × 107
A/mL.Heterotrophism anaerobe referred herein refers to that using sulfate be electron acceptor, using organic matter as electron donor, with sulphur
Change hydrogen be reduzate sulfate reducing bacteria, as desulfurization tubulose Pseudomonas (Desulforhopalus).
Currently preferred, film described in step 3) is the high-quality film of good seal performance, and color is dark color.
It is currently preferred, film described in step 3) be polyvinyl chloride, polyethylene, polypropylene, polystyrene or other
Plastic foil made of resin, film with a thickness of 0.05-0.20mm.
Currently preferred, thermal insulation material described in step 3) selects straw.
Beneficial effects of the present invention are as follows:
The present invention makes the exchangeable species heavy metal for being easier to be absorbed by plants in soil by the way that organic acid chemical substance is added first
Chelating or complexing occurs with organic acid substance rapidly, bioremediation agents are secondly added, the sulfate in renovation agent is also
For opportunistic pathogen using organic acid substance as electron donor, the hydrogen sulfide of generation directly forms aurosulfo with chelating or the heavy metal of complexing
Belong to precipitating, to not be absorbed by crops, heavy metal pollution of soil problem is governed.After reparation, film, extra H are taken off2S
Evolution, loses anaerobic environment, and soil restoration is normal, and remaining nutrient solution continues as the anaerobe in deep soil and utilized,
It is harmless to soil and crop.The repairing method is chemistry-microbial association reparation, improves biological restoration repair time and longer asks
Topic, it is environmentally protective, it administers in heavy metal soil course and does not constitute pollution to environment, simple process is easy to spread.
Specific embodiment
Embodiment 1
Taking a certain intermediate pollution soil (Cd total amount is 1.39mg/kg, pH5.44) is to administer object.In the improvement phase, outdoor temperature
It is 20-28 DEG C, spray organic acid is propionic acid (1mol/L), spray flow 5m3/ mu after spray terminates 4h, sprays biological prosthetic
Agent, spray flow 15m3/ mu is kept for airtightness 30 days in upper soll layer overlay film, opens closed film, is sampled, and weight in soil is detected
The exchangeable species of metal Cd.
After measured, before administering the exchangeable species of heavy metal in soil Cd are 0.13mg/kg, and Cd is handed in soil after improvement
It changes state and is reduced to 0.049mg/kg, decline 62.31%.Terminate to repair.
Embodiment 2
Taking a certain slight pollution soil (Cd total amount is 0.42mg/kg, pH6.87) is to administer object.In the improvement phase, outdoor temperature
It is 24-34 DEG C, spray organic acid is oxalic acid (1mol/L), spray flow 8m3/ mu after spray terminates 2h, sprays biological prosthetic
Agent, spray flow 25m3/ mu is kept for airtightness 20 days in upper soll layer overlay film, opens closed film, is sampled, and weight in soil is detected
The exchangeable species of metal Cd.
After measured, the exchangeable species of heavy metal in soil Cd are 0.058mg/kg before administering, after improvement in soil Cd can
Exchange state is reduced to 0.014mg/kg, decline 75.86%.Terminate to repair.
Embodiment 3
Taking a certain middle serious pollution soil (Pb total amount is 478 mg/kg, pH6.02) is to administer object.In the improvement phase, outdoor temp
Degree is 12-21 DEG C, and spray organic acid is citric acid (1mol/L), spray flow 10m3/ mu, after spray terminates 3h, spray biology
Renovation agent, spray flow 20m3/ mu in upper soll layer overlay film and covers thermal insulation material, is kept for airtightness 25 days, is opened closed
Film, sampling detect the exchangeable species of heavy metal in soil Pb.
After measured, before administering the exchangeable species of heavy metal in soil Pb are 3.08mg/kg, and Pb is handed in soil after improvement
It changes state and is reduced to 1.47mg/kg, decline 52.27%.The exchangeable species content fall of Pb is not high in soil, repeats to spray lemon
Acid, spray flow 10m3/ mu after spray terminates 3h, sprays bioremediation agents, spray flow 20m3/ mu, in upper soll layer overlay film
And thermal insulation material is covered, it is kept for airtightness 25 days, opens closed film, sampled, detect the exchangeable species of heavy metal in soil Pb.Through
Measurement, the exchangeable species of heavy metal in soil Pb are 1.47mg/kg before administering, and the exchangeable species of Pb are reduced in soil after improvement
0.65mg/kg, decline 55.78%.Terminate to repair.
Embodiment 4
Taking a certain intermediate pollution soil (Cd total amount is 0.96mg/kg, and Pb total amount is 105mg/kg, pH5.73) is to administer object.
In the improvement phase, outdoor temperature is 25-37 DEG C, and spray organic acid is malic acid (1mol/L), spray flow 8m3/ mu, spray terminate
After 4h, bioremediation agents, spray flow 30m are sprayed3/ mu is kept for airtightness 10 days in upper soll layer overlay film, opens closed film,
Sampling detects the exchangeable species of heavy metal in soil Cd and Pb.
After measured, the exchangeable species of heavy metal in soil Cd are 0.089mg/kg before administering, and the exchangeable species of Pb are
0.35mg/kg, the exchangeable species of Cd are reduced to 0.023mg/kg in soil after improvement, and the exchangeable species of Pb are reduced to 0.11mg/kg, point
It Xia Jiang 74.16% and 68.57%.Terminate to repair.
Claims (8)
1. a kind of chemistry-microbial association effect restoration of soil polluted by heavy metal method, which is characterized in that including walking as follows
It is rapid:
1) period in slack season is chosen, the organic acid chemical remediation agent of mass concentration 1mol/L, the spray flow of chemical remediation agent are sprayed
For 5-10m3/ mu；
2) bioremediation agents are sprayed after spraying 2-4h, the spray flow of bioremediation agents is 15-30m3/ mu；The bioremediation agents
Formula are as follows: yeast extract 0.1-1.0g/L, Na2SO4 0.1-0.5g/L、C3H5O3Na 0.1-1.0g/L, and heterotrophism in renovation agent
The biomass of anaerobe is greater than 1.0 × 107A/mL；The heterotrophism anaerobe refers to that using sulfate be electron acceptor,
Using organic matter as electron donor, using hydrogen sulfide as the sulfate reducing bacteria of reduzate；
3) after the completion of the spray of step 2:
It is greater than 18 DEG C of area to outdoor temperature, 0-2h is in upper soll layer overlay film after the completion of spray；
Area to outdoor temperature less than 18 DEG C, 0-2h is in upper soll layer overlay film after the completion of spray, and covers thermal insulation material；
4) it is kept for airtightness 10-30 days after the processing of step 3)；
5) closed film is opened, is sampled, heavy metal in soil exchangeable species are detected；
If 6) heavy metal in soil exchangeable species content reduces not up to 50% or more, repeat above 1) to 5) step.
2. chemistry according to claim 1-microbial association effect restoration of soil polluted by heavy metal method, feature exist
In: in step 1) for heavy-metal contaminated soil choose the period in slack season operate, the period in slack season according to the crop time and
It determines, outdoor temperature is selected to carry out at 5-35 DEG C.
3. chemistry according to claim 1-microbial association effect restoration of soil polluted by heavy metal method, feature exist
In: the agent of organic acid chemical remediation described in step 1) is oxalic acid, propionic acid, citric acid or malic acid.
4. chemistry according to claim 1-microbial association effect restoration of soil polluted by heavy metal method, feature exist
In: sulfate reducing bacteria described in step 2 is desulfurization tubulose Pseudomonas.
5. chemistry according to claim 1-microbial association effect restoration of soil polluted by heavy metal method, feature exist
In: the color of film described in step 3) is dark color.
6. chemistry according to claim 1-microbial association effect restoration of soil polluted by heavy metal method, feature exist
In: the film be polyvinyl chloride, polyethylene, polypropylene, plastic foil made of polystyrene or other resins.
7. chemistry described according to claim 1 or 5 or 6-microbial association effect restoration of soil polluted by heavy metal method,
Be characterized in that: the film with a thickness of 0.05-0.20mm.
8. chemistry according to claim 1-microbial association effect restoration of soil polluted by heavy metal method, feature exist
In: thermal insulation material described in step 3) selects straw.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910329576.5A CN110076189A (en) | 2019-04-23 | 2019-04-23 | Method for restoring heavy metal contaminated soil by chemical-microbial combined action |
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| CN201910329576.5A CN110076189A (en) | 2019-04-23 | 2019-04-23 | Method for restoring heavy metal contaminated soil by chemical-microbial combined action |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114669593A (en) * | 2022-03-01 | 2022-06-28 | 武汉市秀谷科技有限公司 | Treatment method for farmland heavy metal chromium pollution |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909215A (en) * | 2012-11-13 | 2013-02-06 | 华北电力大学 | Method for repairing soil polluted by heavy metal by combining chemical leaching and bioremediation |
| CN103418608A (en) * | 2013-07-16 | 2013-12-04 | 中国科学院过程工程研究所 | Method for jointly repairing heavy metal contaminated soil at mining areas through microorganism-chemical method |
| CN104068520A (en) * | 2014-06-30 | 2014-10-01 | 江阴市红卫青山纺织有限公司 | Static electricity dredging electric arc protective clothing |
| CN107159709A (en) * | 2017-07-25 | 2017-09-15 | 中国地质科学院矿产综合利用研究所 | Method for repairing heavy metal contaminated soil by artificially enhancing self-cleaning effect of soil |
| CN108114978A (en) * | 2017-12-29 | 2018-06-05 | 成都新柯力化工科技有限公司 | A kind of method of the efficient rehabilitating soil of chemistry-microorganism |
-
2019
- 2019-04-23 CN CN201910329576.5A patent/CN110076189A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909215A (en) * | 2012-11-13 | 2013-02-06 | 华北电力大学 | Method for repairing soil polluted by heavy metal by combining chemical leaching and bioremediation |
| CN103418608A (en) * | 2013-07-16 | 2013-12-04 | 中国科学院过程工程研究所 | Method for jointly repairing heavy metal contaminated soil at mining areas through microorganism-chemical method |
| CN104068520A (en) * | 2014-06-30 | 2014-10-01 | 江阴市红卫青山纺织有限公司 | Static electricity dredging electric arc protective clothing |
| CN107159709A (en) * | 2017-07-25 | 2017-09-15 | 中国地质科学院矿产综合利用研究所 | Method for repairing heavy metal contaminated soil by artificially enhancing self-cleaning effect of soil |
| CN108114978A (en) * | 2017-12-29 | 2018-06-05 | 成都新柯力化工科技有限公司 | A kind of method of the efficient rehabilitating soil of chemistry-microorganism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114669593A (en) * | 2022-03-01 | 2022-06-28 | 武汉市秀谷科技有限公司 | Treatment method for farmland heavy metal chromium pollution |
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Application publication date: 20190802 |