CN111530915A - Heavy metal soil remediation method - Google Patents
Heavy metal soil remediation method Download PDFInfo
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- CN111530915A CN111530915A CN202010396872.XA CN202010396872A CN111530915A CN 111530915 A CN111530915 A CN 111530915A CN 202010396872 A CN202010396872 A CN 202010396872A CN 111530915 A CN111530915 A CN 111530915A
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- Prior art keywords
- soil
- heavy metal
- impurities
- namely
- remediation method
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- 239000002689 soil Substances 0.000 title claims abstract description 86
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005067 remediation Methods 0.000 title claims abstract description 26
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims abstract description 6
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229960000892 attapulgite Drugs 0.000 claims abstract description 4
- 239000004927 clay Substances 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims abstract description 4
- 239000004021 humic acid Substances 0.000 claims abstract description 4
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 12
- 239000003607 modifier Substances 0.000 claims description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000009412 basement excavation Methods 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000002028 Biomass Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- 235000012255 calcium oxide Nutrition 0.000 claims description 3
- 239000000378 calcium silicate Substances 0.000 claims description 3
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000003900 soil pollution Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 238000003795 desorption Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008263 repair mechanism Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
Abstract
The invention discloses a heavy metal soil remediation method, which comprises the following steps: transferring, namely, shoveling the soil by adopting an excavator, and conveying the polluted soil to a cement land through a conveyer belt or a dump truck; airing, namely airing and drying the soil, paying attention to weather change, and covering the plastic cloth in time when the soil is exposed to rain and snow; screening, namely removing solid metal impurities and plastic impurities in the soil through a large-scale screening device; detecting, namely detecting the heavy metal type and the heavy metal content in the soil; mixing the modifying agent, namely putting the soil into a treatment pool, adding pure water, adjusting the water content of the soil to 12-20%, adding the modifying agent accounting for 5-8% of the total weight of the soil according to the types and the content of heavy metals in the soil, wherein the modifying agent is one of humic acid, sulphoaluminate cement, attapulgite clay and a passivating agent, and mechanically mixing and stirring; and (6) backfilling. The invention has little pollution to the environment, can remove solid metal impurities and plastic impurities in the soil, has good repairing effect and improves the utilization of land resources.
Description
Technical Field
The invention belongs to the field of soil remediation, and particularly relates to a heavy metal soil remediation method.
Background
Soil remediation is a technical measure to restore normal function to contaminated soil. In the soil remediation industry, the existing soil remediation technologies can be more than one hundred, the common technologies can be more than ten, and the existing soil remediation technologies can be roughly divided into three methods, namely physical methods, chemical methods and biological methods. Many countries in the world, especially developed countries, develop and develop contaminated soil remediation and remediation plans, and therefore an emerging soil remediation industry is formed. Heavy metals are a typical class of remediation objects in the soil remediation industry. At present, for various domestic heavy metal contaminated soil remediation scenes, a rapid and economic stabilization technology is mostly adopted to match practical problems frequently existing in the remediation process such as a short construction period and low capital.
The process of stabilizing and repairing heavy metals in soil is essentially the interaction process between heavy metal elements and repairing materials. This process is essentially an extremely complex process of physicochemical reactions. For a specific repair scenario, consideration is first given to whether the selected repair mechanism based on the stabilization technique can occur thermodynamically. The stabilization process of heavy metal pollutants in soil is the formation process of low-solubility or high-stability products of the heavy metal pollutants. Whether a contact reaction of the repair material with contaminant species can occur under certain conditions determines whether the repair material can stabilize heavy metal contaminants.
At present, the heavy metal soil is repaired by adopting a soil improvement method and a thermal desorption method. The soil improvement method is to uniformly mix soil with normal indexes with contaminated soil or to remove the contaminated soil from the surface layer. The soil improvement method cannot remove heavy metals, but only reduces the content or discards the soil.
The thermal desorption method is to heat the contaminated soil, volatilize some heavy metals after reaching a certain temperature, and then collect and treat the heavy metals. The disadvantage of this technique is that the whole process requires a lot of energy consumption. In addition, if the volatile substances cannot be effectively collected and processed, the atmosphere is easily polluted.
Therefore, it is urgently needed to design an effective heavy metal soil remediation method to reduce the harm to the environment.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a heavy metal soil remediation method, which solves the problems of soil and energy waste and environmental pollution caused by the existing soil remediation method and thermal desorption method.
In order to achieve the aim, the invention provides a heavy metal soil remediation method, which comprises the following steps:
the transfer is carried out by the user,
adopting an excavator to scoop up the soil, and conveying the polluted soil to a cement land through a conveyer belt or a dump truck;
the air is dried in the sun,
drying the soil in the sun, paying attention to weather changes, covering the plastic cloth in time when the soil meets weather of rain and snow;
screening the mixture by using a screen to obtain a powder,
removing solid metal impurities and plastic impurities in the soil through a large-scale sieving machine;
the detection is carried out by detecting the position of the probe,
detecting the heavy metal types and heavy metal contents in the soil;
the mixing and modifying agent is mixed with the mixture,
putting soil into a treatment pool, adding pure water, adjusting the water content of the soil to 12-20%, adding a modifier which accounts for 5-8% of the total weight of the soil according to the type and content of heavy metals in the soil, wherein the modifier is one of humic acid, sulphoaluminate cement, attapulgite clay and a passivator, and mechanically mixing and stirring;
and (4) back-filling the mixture,
and backfilling the treated soil to an excavation position, and paving a covering net on the surface for more than 10 days to prevent dust.
Further, the excavation depth of the transfer step is not less than 1.5 m depending on the degree of soil contamination.
Further, the passivating agent is a mixture of biomass carbon, calcium sulfate, magnesium sulfate and calcium silicate.
Further, a composition containing active silica and quicklime are added when the modifier is mixed.
The invention has the beneficial effects that:
the heavy metal soil remediation method can be used for remedying the polluted soil until the concentration of the heavy metal is lower than the specified requirement, and effectively solidifying the heavy metal. The operation of airing and screening is adopted, solid metal impurities and plastic impurities in the soil are removed, the environmental pollution is small, the repaired soil can be used for planting crops or greening, and the utilization of land resources is improved.
Drawings
Fig. 1 is a schematic flow chart of the heavy metal soil remediation method of the present invention.
Detailed Description
The details of the present invention are described below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a method for remedying heavy metal soil comprises the following steps:
s1, transferring the materials,
adopting an excavator to scoop up the soil, and conveying the polluted soil to a cement land through a conveyer belt or a dump truck;
s2, airing the clothes,
drying the soil in the sun, paying attention to weather changes, covering the plastic cloth in time when the soil meets weather of rain and snow;
s3, screening the mixture,
removing solid metal impurities and plastic impurities in the soil through a large-scale sieving machine;
s4, detecting the position of the target,
detecting the heavy metal types and heavy metal contents in the soil;
s5, mixing the modifier,
putting soil into a treatment pool, adding pure water, adjusting the water content of the soil to 12-20%, adding a modifier which accounts for 5-8% of the total weight of the soil according to the type and content of heavy metals in the soil, wherein the modifier is one of humic acid, sulphoaluminate cement, attapulgite clay and a passivator, and mechanically mixing and stirring;
s6, backfilling is carried out,
and backfilling the treated soil to an excavation position, and paving a covering net on the surface for more than 10 days to prevent dust.
In practical application, the excavation depth of the transferring step is determined according to the soil pollution degree and is not less than 1.5 meters.
In practical application, the passivating agent is a mixture of biomass carbon, calcium sulfate, magnesium sulfate and calcium silicate.
In practical use, the composition containing active silica and quicklime are added when the modifier is mixed.
In summary, the following steps: the invention has little pollution to the environment, can remove solid metal impurities and plastic impurities in the soil, has good repairing effect and improves the utilization of land resources.
The foregoing has described the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the technical spirit and features of the present invention, and the present invention is not limited thereto but may be implemented by those skilled in the art.
Claims (4)
1. A heavy metal soil remediation method is characterized by comprising the following steps: the method comprises the following steps:
s1, transferring the materials,
adopting an excavator to scoop up the soil, and conveying the polluted soil to a cement land through a conveyer belt or a dump truck;
s2, airing the clothes,
drying the soil in the sun, paying attention to weather changes, covering the plastic cloth in time when the soil meets weather of rain and snow;
s3, screening the mixture,
removing solid metal impurities and plastic impurities in the soil through a large-scale sieving machine;
s4, detecting the position of the target,
detecting the heavy metal types and heavy metal contents in the soil;
s5, mixing the modifier,
putting soil into a treatment pool, adding pure water, adjusting the water content of the soil to 12-20%, adding a modifier which accounts for 5-8% of the total weight of the soil according to the type and content of heavy metals in the soil, wherein the modifier is one of humic acid, sulphoaluminate cement, attapulgite clay and a passivator, and mechanically mixing and stirring;
s6, backfilling is carried out,
and backfilling the treated soil to an excavation position, and paving a covering net on the surface for more than 10 days to prevent dust.
2. The heavy metal soil remediation method of claim 1, wherein: the excavation depth of the transfer step is determined according to the soil pollution degree and is not less than 1.5 m.
3. The heavy metal soil remediation method of claim 2, wherein: the passivating agent is a mixture of biomass carbon, calcium sulfate, magnesium sulfate and calcium silicate.
4. The heavy metal soil remediation method of claim 1, wherein: when the modifier is mixed, a composition containing active silica and quicklime are added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010396872.XA CN111530915A (en) | 2020-05-12 | 2020-05-12 | Heavy metal soil remediation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010396872.XA CN111530915A (en) | 2020-05-12 | 2020-05-12 | Heavy metal soil remediation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111530915A true CN111530915A (en) | 2020-08-14 |
Family
ID=71967931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010396872.XA Pending CN111530915A (en) | 2020-05-12 | 2020-05-12 | Heavy metal soil remediation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111530915A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113210410A (en) * | 2021-05-17 | 2021-08-06 | 深圳市金海威景观设计工程有限公司 | Heavy metal contaminated soil treatment method and device for implementing same |
-
2020
- 2020-05-12 CN CN202010396872.XA patent/CN111530915A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113210410A (en) * | 2021-05-17 | 2021-08-06 | 深圳市金海威景观设计工程有限公司 | Heavy metal contaminated soil treatment method and device for implementing same |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200814 |