CN108213073A - 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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- CN108213073A CN108213073A CN201810008167.0A CN201810008167A CN108213073A CN 108213073 A CN108213073 A CN 108213073A CN 201810008167 A CN201810008167 A CN 201810008167A CN 108213073 A CN108213073 A CN 108213073A
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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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- 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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- Environmental & Geological Engineering (AREA)
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Abstract
The present invention is directed to the deficiency of existing heavy-metal contaminated soil administering method, it provides a kind of use inorganic solidification agent and uses restorative procedure with microbial association, the soil-repairing agent that the restorative procedure uses includes sulphate aluminium cement, silicon ash, biomass, microbial bacterial agent, soil is repaired using this method, not only remediation efficiency is high, and repairing efficiency is short, and effect is good, the tradable heavy metal ion in soil can be effectively reduced, while it is hardened to have many advantages, such as that steady in a long-term, soil is not easy.
Description
Technical field
This application involves field of environment protection more particularly to a kind of restorative procedures of heavy-metal contaminated soil.
Background technology
China's heavy metal pollution of soil is more universal and serious, not only influences the yield and quality of crops and aquatic products,
The life and health of the mankind may also be endangered by food chain.Due to sources of heavy metal complexity, between different heavy metals and and its
The interaction of his pollutant generates the complexity of various combined pollutions, increases the difficulty studied heavy metal, in environment dirt
In dye research, heavy metal is primarily referred to as the significant element of the bio-toxicities such as Pb, Cd, Hg, Cr, further includes the weight with certain toxicity
The elements such as metal Zn, Cu, Co, Ni and Sn.In recent years, China increases the reparation to heavy-metal contaminated soil, therefore for low
The good soil remediation method of cost, effect needs urgent.
Classify according to Principles, heavy-metal contaminated soil restorative procedure includes at present：1) change heavy metal in the soil
Existence form, reduce its toxicity, for example, by using fixing-stable method make organic intercalating agent or curing agent in contaminated soil
Heavy metal reacts, and generates stable material, so as to reduce the Leaching of heavy metal, achievees the purpose that reparation.2) by weight in soil
Metal removal, such as Electroremediation, by plugging electrode at contaminated soil both ends, after powering on, the band electrochondria in soil
On sub- electrotropism electrode, to achieve the purpose that remove Heavy Metals in Contaminated Soils.Since heavy metals immobilization stabilization technology has
The advantages that repairing effect is good, and rehabilitation cost is relatively low is remediation of heavy metal-contaminated soil more commonly used at present.Such as apply
Number a kind of modification method of heavy-metal contaminated soil is disclosed for 200910194051.1 Chinese invention patent, pass through suction
The response inhabitations such as attached, chelant, complexing matrix aoxidizes, and fixed heavy metal ion simultaneously reduces its biology toxicity；Reduce heavy metal from
Diffusion and leakage of the son to surrounding soil or water body.Chinese invention patent application application No. is 201210107906.4 discloses
One heavy metal species normal temperature cure agent, main component are magnesia and potassium dihydrogen phosphate.Application No. is 201210383318.3
Chinese invention patent discloses one kind with sulphate aluminium cement reparation curing agent as main component, but uses the renovation agent reparation
Later stage discovery can cause soil hardened phenomenon occur.In addition, also there is the method repaired using microorganism, such as application number
201410190636.7 Chinese patent literature discloses a kind of soil-repairing agent and includes bacillus laterosporus conidia powder, withered grass bud
Spore bacillus spores powder, organic fertilizer, peat and sepiolite.
The recovery technique research of heavy-metal contaminated soil is the emphasis of environmental engineering Science and Technology research, using nothing
Machine curing stabilizer is although at low cost, and effect is preferable, but easily the phenomenon that soil hardening, also, improper use occurs, not only up to not
To repairing effect, it will appear new pollution instead.And organic matter is added to handle using microbial technique, then can reach it is safer,
The effect of holding effect, but its degradation or complexing power to heavy metal is limited, works slower.
Present inventor has found in the studying for a long period of time of heavy metal pollution soil remediation, using inorganic solidification agent with it is micro-
Bio combined use, not only remediation efficiency is high, and effect is good, and it is hardened to have many advantages, such as that holding effect, soil are not easy.
Invention content
For the deficiency of existing heavy-metal contaminated soil administering method, present applicant proposes it is a kind of using inorganic solidification agent with
The soil remediation method that microbial bacterial agent is used in combination, not only remediation efficiency is high for the restorative procedure, and repairing efficiency is short, and effect is good,
The tradable heavy metal ion in soil can be effectively reduced, while it is hardened to have many advantages, such as that steady in a long-term, soil is not easy.
The prior art has disclosed, and the calcium sulphoaluminate in sulphate aluminium cement can react to form single sulfur type hydration sulphur with water
Calcium aluminate (i.e. entringite), in the environment of entringite, heavy metal compound chemical bond rupture, with atom in entringite
The recombination of key is learned, so as to lock heavy metal ion, reaches cured purpose, and then reduce the Leaching of heavy metal.From practice
From the point of view of, repaired using sulphate aluminium cement, solidification effect is rapid-action, but also along with soil it is easily hardened the shortcomings of, no
Conducive to the growth of later stage plant, and over time, there is the phenomenon that heavy metal ion leaches again.
In view of the above-mentioned problems, inventor makes sulphate aluminium cement curing agent and silicon ash, biomass, microbial bacterial agent cooperation
With discovery can either keep the efficient solidification of sulphate aluminium cement in a certain proportion, moreover it is possible to soil be avoided to go out
The phenomenon that existing hardened hardening, but when microbial bacterial agent dosage not at that time, the solidification effect of sulphate aluminium cement can but weaken,
It is unfavorable for the curing to heavy metal, and soil compaction phenomenon is effectively alleviated.
In order to solve the above technical problems, invention provides a kind of restorative procedure of heavy-metal contaminated soil, the restorative procedure
Including：1) soil-repairing agent is prepared, the soil-repairing agent includes sulphate aluminium cement, silicon ash, biomass, microbial bacterial agent；
2) soil-repairing agent that step 1) is prepared uniformly is sprinkling upon soil surface to be repaired, and thickness is 1-4 centimetres, wherein
The dosage of soil-repairing agent is the 5%-10% of soil quality；Then spray sprinkler, the quality of water used in spray sprinkler are soil
The 60%-80% of renovation agent quality；It after spray sprinkler, digs, renovation agent and soil is uniformly mixed, stand 1-2h；Again
Secondary spray sprinkler is stirred in watering, and water consumption is the 80-100% of soil quality；Finally soil is placed under natural environment,
Heavy rain is avoided to wash away in the first two months.
Further, preferably, the operation of step 1) is as follows：Biomass with pulper is blended, crosses 100-200 mesh
Sieve, obtained powdered biomass is exposed to the sun, is then uniformly mixed with microbial bacterial agent, obtains mixture 1；By sulphate aluminium cement
It is uniformly mixed to obtain mixture 2 with silicon ash；After mixture 1 and 2 is sufficiently mixed, the soil-repairing agent is obtained.
Further, the soil-repairing agent presses mass parts, including：
Further, the mass ratio of the sulphate aluminium cement and microbial bacterial agent is 3-5:1；
Further, the mass ratio of the sulphate aluminium cement and microbial bacterial agent is preferably 4:1；
Further, the sulphate aluminium cement and the mass ratio of biomass are 1:1-1.5；More preferably 1:1；
Further, in the silicon ash, Si02Content is more than 80%, A1 of silicon ash quality203Content is more than silicon ash quality
10%.
As preferred scheme is invented, the soil-repairing agent includes：
The mass ratio of the sulphate aluminium cement and microbial bacterial agent is 3-5:1；
The sulphate aluminium cement and the mass ratio of biomass are 1:1-1.5；
In the silicon ash, Si02Content is more than 80%, A1 of silicon ash quality203Content is more than the 10% of silicon ash quality.
Further, as invention the most preferred embodiment, the soil-repairing agent includes：
The mass ratio of the sulphate aluminium cement and microbial bacterial agent is 4:1；
The sulphate aluminium cement and the mass ratio of biomass are 1:1；
In the silicon ash, Si02Content is more than 80%, A1 of silicon ash quality203Content is more than the 10% of silicon ash quality.
Applicant has found that the mass ratio of sulphate aluminium cement and microbial bacterial agent fixes it effect of heavy metal under study for action
Fruit has certain influence：When the mass ratio of sulphate aluminium cement and microbial bacterial agent is less than 2:When 1, fixed speed is slower, fixed effect
Fruit is weak；And when it is more than 6:When 1, discovery has small part soil sample still to will appear local hardened phenomenon, it is therefore preferable that control is in 3-
5:1。
Microorganism used therefor microbial inoculum of the present invention, can be those microbial bacterial agents commonly used in the art, such as nitrogen-fixing bacteria bacterium
Agent, silicate microbial bacterial agent, organic matter decomposing inoculant, biological prosthetic microbial inoculum etc..
The invention further relates to application of the above-mentioned soil remediation method in heavy-metal contaminated soil reparation.
Beneficial effects of the present invention：The present invention is used using inorganic solidification agent and microbial association, on the one hand can be passed through
Inorganic solidification agent sulphate aluminium cement carries out heavy metal ion fixation rapidly and efficiently；On the other hand, due to adding biology
Matter and microbial bacterial agent, microbial bacterial agent can go deep into the inside of soil, advantageously reduce the leaching concentration of heavy metal, improve a huge sum of money
Belong to contaminated soil, while improve soil aggregate structure, eliminate hardened phenomenon；The heavy metal for reducing immobilization simultaneously leaches again
The phenomenon that.
Specific embodiment
To make technical scheme of the present invention and its technique effect clearer, clear and definite, example below is enumerated to the present invention
Specific embodiment is further described, but is not intended to limit the present invention.
The step of soil-repairing agent general preparative methods of the present invention, is as follows：1) biomass with pulper is blended, be sieved
(100-200 mesh), obtained powdered biomass is exposed to the sun, is then uniformly mixed with microbial bacterial agent, obtains mixture 1；2) will
Sulphate aluminium cement is uniformly mixed to obtain mixture 2 with silicon ash；3) after mixture 1 and 2 is sufficiently mixed, the soil of the present invention is obtained
Earth renovation agent.
The embodiment of the present application microorganism used therefor microbial inoculumEffective bacterium is bacillus subtilis and gel-shaped brood cell
Bacillus opens Bioisystech Co., Ltd purchased from Jinan building.
Embodiment 1
The component of soil-repairing agent 1：
According to above-mentioned general preparative methods, according to component proportion, corresponding soil-repairing agent 1 is prepared.In silicon ash used, Si02Contain
Amount is about 85%, A1203Content about 12%.
Embodiment 2
The component of soil-repairing agent 2：
According to above-mentioned general preparative methods, according to component proportion, corresponding soil-repairing agent 2 is prepared.In silicon ash used, Si02Contain
Amount is about 85%, A1203Content about 12%.
Embodiment 3
The component of soil-repairing agent 3：
According to above-mentioned general preparative methods, according to component proportion, corresponding soil-repairing agent 3 is prepared.In silicon ash used, Si02Contain
Amount is about 85%, A1203Content about 12%.
Embodiment 4
The component of soil-repairing agent 4：
According to above-mentioned general preparative methods, according to component proportion, corresponding soil-repairing agent 4 is prepared.In silicon ash used, Si02Contain
Amount is about 85%, A1203Content about 12%.
Test example 1
Repairing effect for the soil-repairing agent for further illustrating the application, by taking the renovation agent of embodiment 3 as an example, to being selected from two
Different mine Soil Surroundings are repaired, and before and after reparation, several important most toxic Leaching of Heavy Metals concentration carry out
Detection, is repaired as follows：Soil-repairing agent is uniformly sprinkling upon to soil surface to be repaired, thickness is 2 centimetres, wherein
The dosage of soil-repairing agent is the 8% of soil quality；Then spray sprinkler, the quality of water used in spray sprinkler are soil-repairing agent
The 70% of quality；It after spray sprinkler, digs, renovation agent and soil is uniformly mixed, stand 1.5h；Spray sprinkler again,
It is stirred in watering, water consumption is the 90% of soil quality；Finally soil is placed under natural environment, heavy rain is avoided to wash away,
1d, 30d, 60d, 360d sampling carry out repairing effect analysis, as a result as shown in table 1- tables 2.
Table 1：The repairing effect analysis of No. 1 mine Soil Surrounding
From the point of view of table 1, renovation agent of the invention can fix rapidly heavy metal, substantially reduce the leaching concentration of heavy metal,
The ratio of heavy metal exchangeable species is reduced, so as to achieve the purpose that rehabilitating soil.Particularly, when reparation using the present invention
When agent is repaired, after repairing 1 day, higher metal fixed rate can be reached, and with the extension of time, heavy metal fixed rate not
Disconnected raising, after 1 month, substantially with regard to can reach more than 90% fixed rate, after repairing 2 months, heavy metal fixed rate is just
More than 96% can be reached, reparation speed is fast, and after nearly 1 year, still maintains high fixed rate, therefore, the application
Renovation agent be capable of the fixation heavy metal of continuous and effective.In addition, 30 days, 60 days, 360 days each stage observation soil after repair
Configuration state finds the looseness of soil after repairing, does not occur any hardened phenomenon, overcomes and use aluminium sulfate in the prior art
The defects of cement restoration of soil polluted by heavy metal is easily hardened.
Table 2：The repairing effect analysis of No. 2 mine Soil Surroundings
Likewise, the soil on No. 2 mine peripheries after repair 30 days, 60 days, from the point of view of 360 days each stages, also reached similar
Repairing effect, the looseness of soil after reparation do not occur any hardened phenomenon yet.
Test example 2
The relationship of sulphate aluminium cement and microbial bacterial agent in soil-repairing agent further to probe into the present invention, inventor's selection
Soil with batch of No. 1 mine periphery is repaired for soil sample, the renovation agent used for：28 parts of sulphate aluminium cement and silicon ash
The renovation agent of 10 parts of compositions, wherein renovation agent dosage are used by the 8% of soil quality, according to the identical repair process of test example 1
It is repaired, repairs result such as table 3.
Table 3 is individually analyzed using the repairing effect of sulphate aluminium cement and the renovation agent of silicon ash composition
When sulphate aluminium cement and silicon ash is used alone as renovation agent component as can be seen from Table 3, rate is repaired compared to this
Invention is slower, and particularly, after 360 days, in addition to Cu, the leaching concentration of other heavy metals was risen instead compared to the 180th day
Height declines the fixed rate of heavy metal.In addition, in the test example, find after 60 days, soil texture starts to occur
After 360 days, there is more serious hardened situation in local hardened phenomenon.
To sum up, when using sulphate aluminium cement and microbial bacterial agent as renovation agent, due to the adjustment effect of microorganism,
So that solidification effect is more preferable, while the structure of soil is improved, avoid soil hardening.
Although present invention has been a degree of descriptions, it will be apparent that, do not departing from the spirit and scope of the present invention
Under the conditions of, the appropriate variation of each condition can be carried out.It is appreciated that the present invention is not limited to the embodiment, and it is attributed to right
It is required that range, include the equivalent replacement of each factor.
Claims (10)
1. a kind of heavy-metal contaminated soil restorative procedure, including step：
1) soil-repairing agent is prepared, the soil-repairing agent includes sulphate aluminium cement, silicon ash, biomass, microbial bacterial agent；
2) soil-repairing agent that step 1) is prepared uniformly is sprinkling upon soil surface to be repaired, and thickness is 1-4 centimetres, wherein
The dosage of soil-repairing agent is the 5%-10% of soil quality；Then spray sprinkler, the quality of water used in spray sprinkler are soil
The 60%-80% of renovation agent quality；It after spray sprinkler, digs, renovation agent and soil is uniformly mixed, stand 1-2h；Again
Secondary spray sprinkler is stirred in watering, and water consumption is the 80-100% of soil quality；Finally soil is placed under natural environment,
Heavy rain is avoided to wash away in the first two months.
2. soil remediation method according to claim 1, which is characterized in that the dosage of the soil-repairing agent is soil matter
The 8% of amount.
3. according to claim 1-2 any one of them soil remediation methods, which is characterized in that second of spray sprinkler uses water
Measure 90% for soil quality.
4. according to claim 1-3 any one of them soil remediation methods, which is characterized in that the soil-repairing agent is included such as
Lower component：
5. according to claim 1-4 any one of them soil remediation methods, which is characterized in that the soil-repairing agent is included such as
Lower component：
6. according to claim 1-5 any one of them soil remediation methods, which is characterized in that the sulphate aluminium cement with it is micro-
The mass ratio of bacteria agent is 3-5:1.
7. according to claim 1-6 any one of them soil remediation methods, which is characterized in that the sulphate aluminium cement and life
The mass ratio of substance is 1:1-1.5.
8. according to claim 1-7 any one of them soil remediation methods, which is characterized in that in the silicon ash, Si02 contents
80%, A1203 contents more than silicon ash quality are more than the 10% of silicon ash quality.
9. according to claim 1-8 any one of them soil remediation methods, which is characterized in that the soil-repairing agent is included such as
Lower component：
The mass ratio of the sulphate aluminium cement and microbial bacterial agent is 4:1；
The sulphate aluminium cement and the mass ratio of biomass are 1:1.
10. application of the claim 1-9 any one of them soil remediation methods in restoration of soil polluted by heavy metal.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108787734A (en) * | 2018-05-25 | 2018-11-13 | 四川川能环保科技有限公司 | A kind of method of curing agent and microbial association restoration of soil polluted by heavy metal |
| CN109092888A (en) * | 2018-08-22 | 2018-12-28 | 山西华欣久泰科技有限公司 | A kind of mixing restorative procedure of heavy-metal contaminated soil |
| CN109226248A (en) * | 2018-08-22 | 2019-01-18 | 山西华欣久泰科技有限公司 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN109675923A (en) * | 2019-03-05 | 2019-04-26 | 河北地质大学 | A kind of lead-zinc ore tailings library and neighboring soil Compound Heavy Metals repair system |
| CN110947749A (en) * | 2019-11-25 | 2020-04-03 | 江苏隆昌化工有限公司 | Ecological restoration method suitable for heavy metal contaminated soil in northern rainless arid area |
| CN111040771A (en) * | 2019-12-07 | 2020-04-21 | 重庆市固体废物管理服务中心有限公司 | Site-contaminated soil ex-situ remediation agent and application method thereof |
| CN114574210A (en) * | 2022-03-24 | 2022-06-03 | 杨万成 | Curing agent for repairing heavy metal contaminated soil |
| CN114885768A (en) * | 2022-03-30 | 2022-08-12 | 杭州市富阳区农业技术推广中心 | Continuous cropping obstacle sustainable prevention and control method for solanaceous vegetables |
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| CN109675923A (en) * | 2019-03-05 | 2019-04-26 | 河北地质大学 | A kind of lead-zinc ore tailings library and neighboring soil Compound Heavy Metals repair system |
| CN110947749A (en) * | 2019-11-25 | 2020-04-03 | 江苏隆昌化工有限公司 | Ecological restoration method suitable for heavy metal contaminated soil in northern rainless arid area |
| CN110947749B (en) * | 2019-11-25 | 2021-09-10 | 江苏隆昌化工有限公司 | Ecological restoration method suitable for heavy metal contaminated soil in northern rainless arid area |
| CN111040771A (en) * | 2019-12-07 | 2020-04-21 | 重庆市固体废物管理服务中心有限公司 | Site-contaminated soil ex-situ remediation agent and application method thereof |
| CN114574210A (en) * | 2022-03-24 | 2022-06-03 | 杨万成 | Curing agent for repairing heavy metal contaminated soil |
| CN114885768A (en) * | 2022-03-30 | 2022-08-12 | 杭州市富阳区农业技术推广中心 | Continuous cropping obstacle sustainable prevention and control method for solanaceous vegetables |
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