CN107282625A - A kind of heavy-metal contaminated soil renovation agent and its application and the method for repairing polluted soil - Google Patents
A kind of heavy-metal contaminated soil renovation agent and its application and the method for repairing polluted soil Download PDFInfo
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- CN107282625A CN107282625A CN201710707977.0A CN201710707977A CN107282625A CN 107282625 A CN107282625 A CN 107282625A CN 201710707977 A CN201710707977 A CN 201710707977A CN 107282625 A CN107282625 A CN 107282625A
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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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Abstract
The present invention relates to a kind of heavy-metal contaminated soil renovation agent and its application and the method for repairing polluted soil, the heavy-metal contaminated soil renovation agent, it includes each component of following parts by weight：50 80 parts of sludge, 20 30 parts of charcoal, 12 20 parts of organic matter, 10 20 parts of plant ash, 5 10 parts of montmorillonitic clay, 5 10 parts of ferroso-ferric oxide, 25 parts of sodium chloride and 38 parts of sodium phosphates, preferably also include 13 parts of humic acid.Present invention also offers the application of the heavy-metal contaminated soil renovation agent and the method for its repairing polluted soil.The heavy-metal contaminated soil renovation agent that the present invention is provided avoids the secondary pollution produced when heavy metal contaminated soil is repaired, shortens repairing efficiency, and repairing effect is good.
Description
Technical field
The present invention relates to a kind of soil-repairing agent, and in particular to a kind of heavy-metal contaminated soil renovation agent and its English are with repairing
The method of multiple contaminated soil.
Background technology
Heavy metal pollution of soil (heavy metal pollution of the soil) refers to due to mankind's activity, soil
Content of the minor metallic element in soil in earth exceedes background value, and too high levels caused by excess deposition are referred to as soil
Earth heavy metal pollution.
Heavy metal generally refers to about 60 kind elements or proportion about 45 kind elements more than 5.0 of the proportion more than 4.0.
Heavy metal in Study on environmental pollution is primarily referred to as the significant element of the bio-toxicity such as Pb, Cd, Hg, Cr and metalloid As, also
Including the element such as the heavy metal Zn with certain toxicity, Cu, Co, Ni and Sn.Some heavy metal elements are human body and other biologies
Element necessary to body, but its concentration exceedes certain limit and will cause poisoning.
And farmland soil heavy metals pollution has huge harmfulness, heavy metal in soil pollution can not only cause crops to subtract
Production and quality decline, can also be entered people's human body through food chain, are detrimental to health and life security by soil-plant system.
At present, heavy metal-polluted soil recovery technique is broadly divided into peripheral doses, chemical remediation, phytoremediation, microorganism remediation
With agriculture project recovery technique.
The more commonly used in peripheral doses is electric repairing technique mainly by applying straight in heavy-metal contaminated soil both sides
Electric field formation electric-force gradient is flowed, heavy metal contaminants are brought to electrode two ends, so as to reach the purpose of cleaning contaminated soil.
Chemical method includes Soil leaching and chemistry is fixed.Wherein, Soil leaching is by using leacheate or containing energy
Improve the solution of heavy metal soluble reagents to elute contaminated soil, the heavy metal in solid phase of soil is transferred in liquid phase, then
The complex compound or generation relatively stablized with the compound or anion containing certain ligand and heavy metal formation are precipitated.Chemical fixation is
By toward the additives such as addition organic matter, zeolite and phosphate in soil, adjusting and changing thing of the heavy metal in soil
Physicochemical property, makes it produce the series reactions such as precipitation, absorption, ion exchange, humification and redox, reduces it in soil
Biological effectiveness and transportable property in earth environment is so as to reduce toxicity of these heavy metal elements to animals and plants.
Phytoremediation is that contaminated soil is repaired using plant and its rhizosphere microbial, by over-accumulated plant to soil
The absorption transfer of heavy metal in earth, phytoremediation can be divided into plant extract, phytovolatilization, three classifications of plant stability.
Microorganism remediation refers to, using functional microorganism group that is naturally occurring or manually cultivating, promote or enhancement microbiological
Metabolism, so as to reach that toxic pollutant is active in reduction soil or is degraded into the bioremediation technology of innocuous substance.Micro- life
The repair mechanisms of thing mainly have biological adsorption, the redox of bioconversion and microorganism heavy metal ion, dissolve, methylate
Effect.
Agriculture project recovery technique refers to the method using physical mechanical, contaminated topsoil is lived with not contaminated
Property soil covering or go the method that activates lower soil farming after skim-coat polluted soil.Engineering Remediation Techniques are mainly changed
Soil, soil moved in improve the original, deep ploughing are digged.
Heavy metal recovery technique above has certain heavy metal repairing effect, but it also respectively has scarce in actual applications
Point.In above-mentioned heavy metal-polluted soil recovery technique, heavy metal chemical fastening techniques are good due to its repairing effect, and rehabilitation cost is more low
Advantage, is remediation of heavy metal-contaminated soil the more commonly used at present.But current published heavy metal chemical fastening techniques
In, the material used inherently has certain harm to environment, is such as delivered the secondary dirt that soil is likely to result in soil
Dye, in addition, some immobilization chemistries are present, handled heavy metal is more single, and repairing efficiency is longer, long-term repair effect
Not good the shortcomings of.
The content of the invention
It is an object of the invention to overcoming problems of the prior art there is provided heavy-metal contaminated soil renovation agent and its
Using the method with repairing polluted soil, the heavy-metal contaminated soil renovation agent can be realized to heavy metal in soil ionic adsorption
The secondary pollution produced when fixing, avoiding heavy metal contaminated soil from being repaired, and repairing efficiency can be shortened, raising is repaiied
Multiple effect.
The technical scheme is that：
A kind of heavy-metal contaminated soil renovation agent, includes the component of following parts by weight：
Further, the heavy-metal contaminated soil renovation agent also includes the humic acid of 1-3 parts by weight.
Further, a kind of heavy-metal contaminated soil renovation agent, includes the component of following parts by weight：
Further, the sludge is sewage treatment plant's sludge up to standard, and the humidity of the sludge is 40-60%.
Further, the preparation process of the charcoal is：Biological carbon feedstock is added in pyrolysis reactor, in anaerobic
Under the conditions of, 350-400 DEG C is warming up to, pyrolysis charring reaction is carried out, reacts 1-2 hours, obtains charcoal.
Further, the biological carbon feedstock is the one or more in agricultural crop straw, shell or timber waste.When
When selecting a variety of, mass ratio each other is not limited.
Further, the organic matter is humus.
Present invention also offers application of the heavy-metal contaminated soil renovation agent in restoration of soil polluted by heavy metal.
Further, the heavy-metal contaminated soil renovation agent applies to be repaired according to every kilogram of soil 30-50g ratio
Contaminated soil in.
Further, the heavy-metal contaminated soil renovation agent applies to be repaired according to every kilogram of soil 35-45g ratio
In multiple contaminated soil.
It is including following present invention also offers the method using above-mentioned heavy-metal contaminated soil renovation agent repairing polluted soil
Step：
(1) sludge, charcoal, organic matter, plant ash, montmorillonitic clay, ferroso-ferric oxide and humic acid are taken in mixer
In, it is uniformly mixed, obtains mixture；
(2) take sodium chloride and sodium phosphate soluble in water, obtain mixed aqueous solution；
(3) take the mixture of step (1) to add into the soil for needing to repair, sodium chloride and phosphorus are sprayed into during stirring
The mixed aqueous solution of sour sodium；
(4) contaminated soil containing soil-repairing agent is conserved 3-7 days under normal temperature.
Further, in the step (2), the amount of the water for dissolving sodium chloride and sodium phosphate is：Make final soil
Water content is 25-35%.
Further, in the contaminated soil maintenance processes of the step (4) containing soil-repairing agent, water is sprayed into as needed
Point, to ensure the water content of soil as 25-35%.
Further, the heavy-metal contaminated soil renovation agent applies to be repaired according to every kilogram of soil 30-50g ratio
Contaminated soil in.
Further, the heavy-metal contaminated soil renovation agent applies to be repaired according to every kilogram of soil 35-45g ratio
In multiple contaminated soil.
Present invention has the advantage that：
The present invention is handled contaminated soil using the sludge of sewage plant, on the one hand, sludge can provide abundant
Organic matter and nutritional ingredient, improve the fertility of contaminated soil；The microorganism in sludge is more importantly utilized, accelerates weight in soil
The conversion of metal pollutant, if containing organic pollution in soil in addition, can also be removed during removing heavy metals are removed
A part of organic pollution.The addition of sodium chloride and sodium phosphate, on the one hand, enhance the ionic strength in soil, improves pH value,
On the other hand, the complexing power of heavy metal ion is enhanced, improve soil is knotted power and retentiveness.Plant ash is providing mineral
While element, the pH of soil is adjusted.Charcoal, montmorillonitic clay and ferroso-ferric oxide use cooperatively it is dirty in Adsorption of Heavy Metals
While contaminating thing, its stability is kept.
The heavy-metal contaminated soil renovation agent of the present invention, which can be realized, to be fixed to heavy metal in soil ionic adsorption, controls it
Migration, prevents crop from absorbing heavy metal ion and is reduced into lower valency ion, so as to reduce its toxicity, it is to avoid heavy metal pollution
The secondary pollution produced when soil is repaired, repairing efficiency is short, and repairing effect is good.
Embodiment
Embodiment 1
A kind of heavy-metal contaminated soil renovation agent, includes the component of following parts by weight：
Wherein, sludge is sewage treatment plant's sludge up to standard, and the humidity of the sludge is 52%.
The preparation process of charcoal is：Agricultural crop straw and shell are added in pyrolysis reactor, under anaerobic,
380 DEG C are warming up to, pyrolysis charring reaction is carried out, reacts 1.5 hours, obtains charcoal.
The method of above-mentioned soil-repairing agent restoration of soil polluted by heavy metal, comprises the following steps：
(1) sludge, charcoal, humus, plant ash, montmorillonitic clay, ferroso-ferric oxide and humic acid are taken in mixer
In, it is uniformly mixed, obtains mixture；
(2) take sodium chloride and sodium phosphate soluble in water, obtain mixed aqueous solution；Wherein, for dissolving sodium chloride and sodium phosphate
The amount of water be：The water content for making final soil is 25-35%；
(3) take the mixture of step (1) to add into the soil for needing to repair, sodium chloride and phosphorus are sprayed into during stirring
The mixed aqueous solution of sour sodium；
(4) contaminated soil containing soil-repairing agent is conserved 5 days under normal temperature, in maintenance processes, water is sprayed into as needed
Point, to ensure the water content of soil as 25-35%.
Soil-repairing agent is manured into soil according to every kilogram of soil 35g ratio.
Embodiment 2
A kind of heavy-metal contaminated soil renovation agent, includes the component of following parts by weight：
Wherein, sludge is sewage treatment plant's sludge up to standard, and the humidity of the sludge is 47%.
The preparation process of charcoal is：Agricultural crop straw and shell are added in pyrolysis reactor, under anaerobic,
365 DEG C are warming up to, pyrolysis charring reaction is carried out, reacts 1.5 hours, obtains charcoal.
The method of above-mentioned soil-repairing agent restoration of soil polluted by heavy metal, comprises the following steps：
(1) sludge, charcoal, humus, plant ash, montmorillonitic clay, ferroso-ferric oxide and humic acid are taken in mixer
In, it is uniformly mixed, obtains mixture；
(2) take sodium chloride and sodium phosphate soluble in water, obtain mixed aqueous solution；Wherein, for dissolving sodium chloride and sodium phosphate
The amount of water be：The water content for making final soil is 25-35%；
(3) take the mixture of step (1) to add into the soil for needing to repair, sodium chloride and phosphorus are sprayed into during stirring
The mixed aqueous solution of sour sodium；
(4) contaminated soil containing soil-repairing agent is conserved 4 days under normal temperature, in maintenance processes, water is sprayed into as needed
Point, to ensure the water content of soil as 25-35%.
Soil-repairing agent is manured into soil according to every kilogram of soil 45g ratio.
Embodiment 3
A kind of heavy-metal contaminated soil renovation agent, includes the component of following parts by weight：
Wherein, sludge is sewage treatment plant's sludge up to standard, and the humidity of the sludge is 40%.
The preparation process of charcoal is：Shell and timber waste are added in pyrolysis reactor, under anaerobic,
350 DEG C are warming up to, pyrolysis charring reaction is carried out, reacts 2 hours, obtains charcoal.
The method of above-mentioned soil-repairing agent restoration of soil polluted by heavy metal, comprises the following steps：
(1) sludge, charcoal, humus, plant ash, montmorillonitic clay, ferroso-ferric oxide and humic acid are taken in mixer
In, it is uniformly mixed, obtains mixture；
(2) take sodium chloride and sodium phosphate soluble in water, obtain mixed aqueous solution；Wherein, for dissolving sodium chloride and sodium phosphate
The amount of water be：The water content for making final soil is 25-35%；
(3) take the mixture of step (1) to add into the soil for needing to repair, sodium chloride and phosphorus are sprayed into during stirring
The mixed aqueous solution of sour sodium；
(4) contaminated soil containing soil-repairing agent is conserved 3 days under normal temperature, in maintenance processes, water is sprayed into as needed
Point, to ensure the water content of soil as 25-35%.
Soil-repairing agent is manured into soil according to every kilogram of soil 30g ratio.
Embodiment 4
A kind of heavy-metal contaminated soil renovation agent, includes the component of following parts by weight：
Wherein, sludge is sewage treatment plant's sludge up to standard, and the humidity of the sludge is 60%.
The preparation process of charcoal is：Biological carbon feedstock is added in pyrolysis reactor, under anaerobic, is warming up to
400 DEG C, pyrolysis charring reaction is carried out, reacts 1 hour, obtains charcoal.
Biological carbon feedstock is the one or more in agricultural crop straw, shell or timber waste.
The method of above-mentioned soil-repairing agent restoration of soil polluted by heavy metal, comprises the following steps：
(1) sludge, charcoal, humus, plant ash, montmorillonitic clay, ferroso-ferric oxide and humic acid are taken in mixer
In, it is uniformly mixed, obtains mixture；
(2) take sodium chloride and sodium phosphate soluble in water, obtain mixed aqueous solution；Wherein, for dissolving sodium chloride and sodium phosphate
The amount of water be：The water content for making final soil is 25-35%；
(3) take the mixture of step (1) to add into the soil for needing to repair, sodium chloride and phosphorus are sprayed into during stirring
The mixed aqueous solution of sour sodium；
(4) contaminated soil containing soil-repairing agent is conserved 7 days under normal temperature, in maintenance processes, water is sprayed into as needed
Point, to ensure the water content of soil as 25-35%.
Soil-repairing agent is manured into soil according to every kilogram of soil 50g ratio.
Embodiment 5
1st, a kind of heavy-metal contaminated soil renovation agent, it is characterised in that include the component of following parts by weight：
Wherein, sludge is sewage treatment plant's sludge up to standard, and the humidity of the sludge is 58%.
The preparation process of charcoal is：Agricultural crop straw and shell are added in pyrolysis reactor, under anaerobic,
370 DEG C are warming up to, pyrolysis charring reaction is carried out, reacts 2 hours, obtains charcoal.
The method of above-mentioned soil-repairing agent restoration of soil polluted by heavy metal, comprises the following steps：
(1) sludge, charcoal, humus, plant ash, montmorillonitic clay, ferroso-ferric oxide and humic acid are taken in mixer
In, it is uniformly mixed, obtains mixture；
(2) take sodium chloride and sodium phosphate soluble in water, obtain mixed aqueous solution；Wherein, for dissolving sodium chloride and sodium phosphate
The amount of water be：The water content for making final soil is 25%；
(3) take the mixture of step (1) to add into the soil for needing to repair, sodium chloride and phosphorus are sprayed into during stirring
The mixed aqueous solution of sour sodium；
(4) contaminated soil containing soil-repairing agent is conserved 4 days under normal temperature, in maintenance processes, water is sprayed into as needed
Point, to ensure the water content of soil as 25%.
Soil-repairing agent is manured into soil according to every kilogram of soil 40g ratio.
Comparative example 1
A kind of heavy-metal contaminated soil renovation agent, includes the component of following parts by weight：
Wherein, sludge is sewage treatment plant's sludge up to standard, and the humidity of the sludge is 52%.
The preparation process of charcoal is：Agricultural crop straw and shell are added in pyrolysis reactor, under anaerobic,
380 DEG C are warming up to, pyrolysis charring reaction is carried out, reacts 1.5 hours, obtains charcoal.
The method of above-mentioned soil-repairing agent restoration of soil polluted by heavy metal, comprises the following steps：
(1) sludge, charcoal, humus, plant ash, montmorillonitic clay, ferroso-ferric oxide and humic acid are taken in mixer
In, it is uniformly mixed, obtains mixture；
(2) take sodium chloride and sodium phosphate soluble in water, obtain mixed aqueous solution；Wherein, for dissolving sodium chloride and sodium phosphate
The amount of water be：The water content for making final soil is 25-35%；
(3) take the mixture of step (1) to add into the soil for needing to repair, sodium chloride and phosphorus are sprayed into during stirring
The mixed aqueous solution of sour sodium；
(4) contaminated soil containing soil-repairing agent is conserved 5 days under normal temperature, in maintenance processes, water is sprayed into as needed
Point, to ensure the water content of soil as 25-35%.
Soil-repairing agent is manured into soil according to every kilogram of soil 35g ratio.
Comparative example 2
A kind of heavy-metal contaminated soil renovation agent, includes the component of following parts by weight：
Wherein, sludge is sewage treatment plant's sludge up to standard, and the humidity of the sludge is 52%.
The preparation process of charcoal is：Agricultural crop straw and shell are added in pyrolysis reactor, under anaerobic,
380 DEG C are warming up to, pyrolysis charring reaction is carried out, reacts 1.5 hours, obtains charcoal.
The method of above-mentioned soil-repairing agent restoration of soil polluted by heavy metal, comprises the following steps：
(1) sludge, charcoal, humus, plant ash, montmorillonitic clay, ferroso-ferric oxide and humic acid are taken in mixer
In, it is uniformly mixed, obtains mixture；
(2) take sodium chloride soluble in water, obtain mixed aqueous solution；Wherein, the amount of the water for dissolving sodium chloride is：Make final
The water content of soil is 25-35%；
(3) take the mixture of step (1) to add into the soil for needing to repair, sodium chloride and phosphorus are sprayed into during stirring
The mixed aqueous solution of sour sodium；
(4) contaminated soil containing soil-repairing agent is conserved 5 days under normal temperature, in maintenance processes, water is sprayed into as needed
Point, to ensure the water content of soil as 25-35%.
Soil-repairing agent is manured into soil according to every kilogram of soil 35g ratio.
Test example
The present embodiment is according to GB15618-1995 (standard of soil environment quality) and HJ/T299 sulfonitric methods, to this hair
Soil-repairing agent prepared by bright embodiment 1-2 and comparative example 1-2 is determined to the repairing effect of contaminated soil, the results are shown in Table
1。
Table 1
| Index | Before processing | Embodiment 1 | Embodiment 2 | Comparative example 1 | Comparative example 2 |
| As(mg/kg) | 73.4 | 6.18 | 5.65 | 10.93 | 11.42 |
| Cd(mg/kg) | 9.59 | 0.53 | 0.67 | 1.52 | 1.29 |
| Pb(mg/kg) | 778.1 | 76.2 | 79.8 | 120.7 | 109.0 |
| Cr(mg/kg) | 30.8 | 1.63 | 1.40 | 3.76 | 4.32 |
| Porosity (%) | 38 | 67 | 70 | 51 | 64 |
As can be seen from Table 1, using the soil-repairing agent of the present invention, arsenic in soil, cadmium, lead, chromium can be significantly decreased
Deng the content of heavy metal, porosity is significantly improved, and is conducive to the utilization of soil subsequently.
Above-mentioned detailed description is illustrating for one of them possible embodiments of the present invention, and the embodiment is simultaneously not used to
The scope of the claims of the present invention is limited, all equivalence enforcements or change without departing from carried out by the present invention are intended to be limited solely by the technology of the present invention
In the range of scheme.
Claims (10)
1. a kind of heavy-metal contaminated soil renovation agent, it is characterised in that include the component of following parts by weight：
2. heavy-metal contaminated soil renovation agent according to claim 1, it is characterised in that wherein described heavy metal polluted soil
Earth renovation agent also includes the humic acid of 1-3 parts by weight.
3. heavy-metal contaminated soil renovation agent according to claim 1, it is characterised in that the preparation of wherein described charcoal
Process is：Biological carbon feedstock is added in pyrolysis reactor, under anaerobic, 350-400 DEG C is warming up to, carries out pyrolytic carbon
Change reaction, react 1-2 hours, obtain charcoal.
4. heavy-metal contaminated soil renovation agent according to claim 1, it is characterised in that wherein described charcoal raw material is
One or more in agricultural crop straw, shell or timber waste.
5. the heavy-metal contaminated soil renovation agent according to any one of claim 1-4 is in restoration of soil polluted by heavy metal
Application.
6. application according to claim 5, it is characterised in that wherein described heavy-metal contaminated soil renovation agent is according to every thousand
Gram soil 30-50g ratio is applied in contaminated soil to be repaired.
7. application according to claim 5, it is characterised in that wherein described heavy-metal contaminated soil renovation agent is according to every thousand
Gram soil 35-45g ratio is applied in contaminated soil to be repaired.
8. a kind of method of the repairing polluted soil of heavy-metal contaminated soil renovation agent, it is characterised in that it comprises the following steps：
(1) take sludge, charcoal, organic matter, plant ash, montmorillonitic clay, ferroso-ferric oxide and humic acid in mixer, stir
Mix well mixed, obtain mixture；
(2) take sodium chloride and sodium phosphate soluble in water, obtain mixed aqueous solution；
(3) take the mixture of step (1) to add into the soil for needing to repair, sodium chloride and sodium phosphate are sprayed into during stirring
Mixed aqueous solution；
(4) contaminated soil containing soil-repairing agent is conserved 3-7 days under normal temperature.
9. the method for the repairing polluted soil of heavy-metal contaminated soil renovation agent according to claim 8, it is characterised in that
In wherein described step (2), the amount of the water for dissolving sodium chloride and sodium phosphate is：The water content for making final soil is 25-
35%.
10. the method for the repairing polluted soil of heavy-metal contaminated soil renovation agent according to claim 8, its feature exists
In wherein in contaminated soil maintenance processes of the step (4) containing soil-repairing agent, moisture is sprayed into as needed, to ensure
The water content of soil is 25-35%.
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| CN107936982A (en) * | 2017-11-23 | 2018-04-20 | 河南宗源环保科技有限公司 | A kind of heavy-metal contaminated soil renovation agent |
| CN108002922A (en) * | 2017-12-28 | 2018-05-08 | 台州泰捷化工科技有限公司 | One heavy metal species soil-repairing agent |
| CN108085018A (en) * | 2017-12-30 | 2018-05-29 | 张静 | A kind of soil heavy metal passivant and preparation method thereof |
| CN108080408A (en) * | 2017-12-28 | 2018-05-29 | 台州泰捷化工科技有限公司 | A kind of method of repairing heavy metal in soil pollution |
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Application publication date: 20171024 |