CN114192564A - Allopatric ectopic remediation method for arsenic-contaminated soil - Google Patents
Allopatric ectopic remediation method for arsenic-contaminated soil Download PDFInfo
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- CN114192564A CN114192564A CN202111454672.6A CN202111454672A CN114192564A CN 114192564 A CN114192564 A CN 114192564A CN 202111454672 A CN202111454672 A CN 202111454672A CN 114192564 A CN114192564 A CN 114192564A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005067 remediation Methods 0.000 title claims description 21
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 29
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000003860 storage Methods 0.000 claims abstract description 25
- 238000012216 screening Methods 0.000 claims abstract description 15
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- 238000003756 stirring Methods 0.000 claims abstract description 8
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- 239000003814 drug Substances 0.000 claims abstract description 6
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- 239000012528 membrane Substances 0.000 claims description 17
- 238000011066 ex-situ storage Methods 0.000 claims description 15
- 238000012423 maintenance Methods 0.000 claims description 15
- 239000011241 protective layer Substances 0.000 claims description 14
- 229920001903 high density polyethylene Polymers 0.000 claims description 13
- 239000004700 high-density polyethylene Substances 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 239000004746 geotextile Substances 0.000 claims description 12
- 230000006872 improvement Effects 0.000 claims description 12
- 235000009537 plain noodles Nutrition 0.000 claims description 11
- 230000002265 prevention Effects 0.000 claims description 11
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- 239000003795 chemical substances by application Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910017118 Fe—MnO2 Inorganic materials 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
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- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
Abstract
The invention provides a method for restoring arsenic-polluted soil in different places, which comprises the steps of preventing seepage of a soil storage point in the first step, pretreating soil in the second step, mixing a medicament in the third step, mechanically stirring in the fourth step, discharging in the fifth step, maintaining the soil stacked in the sixth step, detecting and accepting a mud body in the seventh step and burying the soil in the eighth step; in the second step of soil pretreatment, the screening and crushing hopper grinds and crushes the soil by mechanical force until the particle size of the soil is less than or equal to 4.0 mm. Grinding and crushing the screening and crushing hopper to the soil particle size of less than or equal to 4.0mm through different action modes of mechanical force; the caking of the arsenic-containing compound which is unevenly distributed in the soil is uniformly refined through homogenization and screening, so that the caking of the arsenic-containing compound is prevented from being incapable of being permeated by the stabilizer, and the arsenic-containing soil is convenient to carry out deep repair.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a method for remedying arsenic-contaminated soil in a different place and in an different position.
Background
Arsenic pollution refers to environmental pollution caused by arsenic or its compounds. The mining and smelting of arsenic and arsenic-containing metal, the production of glass, pigment, original medicine and paper which use arsenic or arsenic compound as raw material, the combustion of coal and other processes can generate arsenic-containing waste water, waste gas and waste residue, which pollute the environment; the pollution of the arsenic contained in the atmosphere mainly comes from industrial production, use of arsenic-containing pesticides and combustion of coal besides natural reasons such as rock weathering, volcanic eruption and the like; arsenic-containing wastewater, pesticides and smoke can all pollute soil. Arsenic accumulates in the soil and thus enters the crop tissue; arsenic and arsenide generally can enter human bodies through water, atmosphere, food and other ways, so that harm is caused, the toxicity of element arsenic is extremely low, arsenide is toxic, and trivalent arsenic compounds are more toxic than other arsenic compounds; the existing method for repairing the arsenic-polluted soil has the great defects that the arsenic pollution of the soil is caused by different reasons, so that the content of arsenic compounds in the soil at different depths is different, and the arsenic compounds in the soil with higher content cannot be repaired in the process of uniformly distributing the stabilizer in the soil.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for restoring arsenic-polluted soil in different places.
The invention solves the technical problems through the following technical means:
an allopatric ectopic remediation method for arsenic contaminated soil comprises the following steps:
step one, seepage prevention of soil storage points
The soil storage points comprise a temporary contaminated soil storage area, a disposal area, a soil to be detected area and a soil landfill area, and each soil storage point is subjected to anti-seepage treatment; meanwhile, after the temporary contaminated soil storage area stores the contaminated soil, the temporary contaminated soil storage area is subjected to capping treatment;
step two soil pretreatment
Carrying out homogenization and screening on the polluted soil through a screening and crushing hopper, and grinding and crushing the arsenic-containing compound agglomerates and the soil in the polluted soil;
step three agent mixing
Adding quicklime into the polluted soil to adjust the pH value of the soil, and adding a stabilizer into the polluted soil.
Mechanical stirring in step four
Sequentially mixing the contaminated soil added with the medicament for three times by using a stirring device;
step five discharge
Discharging the mixed polluted soil by the mobile soil improving machine, and conveying the discharged polluted soil to a soil area to be detected by a dump truck;
step six stacked soil maintenance
Stacking the treated soil in a soil to-be-detected area for maintenance reaction, and accurately controlling the water content of the polluted soil in the maintenance reaction stage;
step seven mud body detection acceptance
Sampling and accepting the contaminated soil after the maintenance reaction, and carrying out the next step after the acceptance reaches the standard; if the acceptance does not reach the standard, repeating the second step to the seventh step until the acceptance reaches the standard;
eight-step soil landfill
And excavating and transporting the polluted soil which meets the acceptance standard to a soil landfill area, and capping after the landfill is finished.
In the second step of soil pretreatment, the screening and crushing hopper grinds and crushes the soil by mechanical force until the particle size of the soil is less than or equal to 4.0 mm.
As an improvement of the technical scheme, in the step I of seepage prevention of the soil storage points, before the seepage prevention treatment, flattening and compacting the soil storage points until the compactness reaches 0.92; prevention of seepage is handled mainly through two cloth membrane structures and is realized, two cloth membrane structures include plain noodles HDPE membrane and protective layer, the protective layer is provided with two-layerly, and plain noodles HDPE membrane setting is between two-layer protective layer.
As the improvement of the technical scheme, the protective layer comprises long-fiber non-woven geotextile and a high-density polyethylene film, the high-density polyethylene film is provided with two layers, and the long-fiber non-woven geotextile is arranged between the high-density polyethylene films.
As an improvement of the technical scheme, in the step three-agent mixing, the stabilizing agent contains 8% of Fe-MnO2 powder, 62% of fly ash, 3% of activated carbon, 25% of calcium carbonate and 2% of PAM; the Fe-MnO2 powder had a Fe to Mn ratio of 0.4: 0.6.
As an improvement of the technical scheme, the step three of mixing the medicament, the step four of mechanically stirring and the step five of discharging are operated by a soil improvement machine, and the soil can be restored in different places by utilizing the characteristic of autonomous movement of the soil improvement machine.
As an improvement of the above technical scheme, in the step six stacking soil maintenance step, the soil moisture content is controlled to be 20-30% in a maintenance period, and the stacking maintenance period is 3-7 days.
As an improvement of the technical scheme, the thickness of the smooth HDPE film is 1.5mm, and the seepage-proofing coefficient of the smooth HDPE film is less than 1.0 multiplied by 10-13 cm/s; the density of the long-fiber non-woven geotextile is 450g/cm 2.
The invention has the beneficial effects that: grinding and crushing the screening and crushing hopper to the soil particle size of less than or equal to 4.0mm through different action modes of mechanical force; the caking of the arsenic-containing compound which is unevenly distributed in the soil is uniformly refined through homogenization and screening, so that the caking of the arsenic-containing compound is prevented from being incapable of being permeated by the stabilizer, and the arsenic-containing soil is convenient to carry out deep repair.
Drawings
FIG. 1 is a schematic flow chart of a method for ex-situ remediation of arsenic-contaminated soil according to an embodiment of the present invention;
FIG. 2 is a diagram of a structure of two films and one film for the ex-situ remediation method of arsenic-contaminated soil according to an embodiment of the present invention;
in the figure: 1. a smooth HDPE film; 2. a protective layer; 21. long fiber non-woven geotextile; 22. high density polyethylene film.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Examples
As shown in fig. 1, the ex-situ remediation method for arsenic-contaminated soil in the embodiment includes the following steps:
step one, seepage prevention of soil storage points
The soil storage points comprise a temporary contaminated soil storage area, a disposal area, a soil to be detected area and a soil landfill area, and each soil storage point is subjected to anti-seepage treatment; meanwhile, after the temporary contaminated soil storage area stores the contaminated soil, the temporary contaminated soil storage area is subjected to capping treatment;
step two soil pretreatment
Carrying out homogenization and screening on the polluted soil through a screening and crushing hopper, and grinding and crushing the arsenic-containing compound agglomerates and the soil in the polluted soil;
step three agent mixing
Adding quicklime into the polluted soil to adjust the pH value of the soil, and adding a stabilizer into the polluted soil.
Mechanical stirring in step four
Sequentially mixing the contaminated soil added with the medicament for three times by using a stirring device;
step five discharge
Discharging the mixed polluted soil by the mobile soil improving machine, and conveying the discharged polluted soil to a soil area to be detected by a dump truck;
step six stacked soil maintenance
Stacking the treated soil in a soil to-be-detected area for maintenance reaction, and accurately controlling the water content of the polluted soil in the maintenance reaction stage;
step seven mud body detection acceptance
Sampling and accepting the contaminated soil after the maintenance reaction, and carrying out the next step after the acceptance reaches the standard; if the acceptance does not reach the standard, repeating the second step to the seventh step until the acceptance reaches the standard;
eight-step soil landfill
And excavating and transporting the polluted soil which meets the acceptance standard to a soil landfill area, and capping after the landfill is finished.
In the second step of soil pretreatment, the screening and crushing hopper grinds and crushes the soil by mechanical force until the particle size of the soil is less than or equal to 4.0 mm; the caking of the arsenic-containing compound which is unevenly distributed in the soil is uniformly refined through homogenization and screening, so that the caking of the arsenic-containing compound is prevented from being incapable of being permeated by the stabilizer, and the arsenic-containing soil is convenient to carry out deep repair.
As shown in fig. 2, in step one soil deposit point infiltration prevention, in some embodiments, each soil deposit point is subjected to smooth compaction prior to the infiltration prevention treatment until the compaction reaches 0.92; the anti-seepage treatment is mainly realized by a two-cloth one-film structure, the two-cloth one-film structure comprises a smooth HDPE film 1 and a protective layer 2, the protective layer 2 is provided with two layers, and the smooth HDPE film 1 is arranged between the two protective layers 2; protection plain noodles HDPE membrane 1 is convenient for protect through protective layer 2, prevents that plain noodles HDPE membrane 1 from being punctured by the sharp-pointed debris in the place of depositing and the contaminated soil, prevents simultaneously that plain noodles HDPE membrane 1 from directly impacting plain noodles HDPE membrane 1 at contaminated soil unloading in-process soil, leads to air to receive the extrusion between plain noodles HDPE membrane 1 and the place of depositing the soil, and the atmospheric pressure rises and props explosive surface HDPE membrane 1.
As shown in fig. 2, in some embodiments, the protective layer 2 includes a long fiber nonwoven geotextile 21 and a high density polyethylene film 22, the high density polyethylene film 22 is provided in two layers, and the long fiber nonwoven geotextile 21 is provided between the high density polyethylene films 22; the original soil of the storage points is prevented from being polluted by arsenic by carrying out anti-seepage treatment on the storage points; prevent through high density polyethylene membrane 22 that sewage from permeating into long fine non-woven geotextile 21 in, avoid long fine non-woven geotextile 21 to be corroded, lead to plain noodles HDPE membrane 1 direct contact to pollute soil, avoid plain noodles HDPE membrane 1 to damage.
As shown in fig. 1, in some embodiments, in the step three agent mixing, the stabilizer contains 8% Fe-MnO2 powder, 62% fly ash, 3% activated carbon, 25% calcium carbonate, and 2% PAM, the Fe-MnO2 powder has a Fe-mn ratio of 0.4: 0.6; by synthesizing ferric oxide, manganese oxide and a compound thereof, the adsorption rate of arsenic is improved by researching the structural characteristics of the ferric oxide, manganese oxide and the compound thereof by adopting SEM.
As shown in fig. 1, in some embodiments, the step three of mixing the chemical agent, the step four of mechanically stirring and the step five of discharging are all operated by the soil improvement machine, and the contaminated soil and the stabilizing agent can be sequentially mixed three times by the soil improvement machine in the step four of mechanically stirring, so that the stabilizing agent and the contaminated soil can be uniformly mixed, and the remediation effect can be improved.
In some embodiments, as shown in fig. 1, in the step six stacking soil curing step, the soil moisture content is controlled to be 20-30% in the curing period, the soil moisture content is detected in real time, and when the soil moisture content is lower than 20%, the soil is added with water continuously and properly; when the water content of the soil is higher than 30%, the soil is subjected to solarization and airing; maintaining for 3-7 days; the water content of the soil is controlled to be 20-30%, so that the PH value is conveniently kept in the optimal reaction interval of the stabilizer reaction, and the stabilizer can exert the maximum reaction effect.
As shown in FIG. 2, in some embodiments, the smooth HDPE film 1 has a thickness of 1.5mm and a barrier coefficient of less than 1.0X 10-13 cm/s; the density of the long-fiber non-woven geotextile 21 is 450g/cm 2; and secondary pollution caused by the disturbance of the polluted soil or atmospheric precipitation and the like in the treatment process of the polluted soil is prevented.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. An allopatric ectopic remediation method for arsenic contaminated soil is characterized by comprising the following steps: the method comprises the following steps:
step one, seepage prevention of soil storage points
The soil storage points comprise a temporary contaminated soil storage area, a disposal area, a soil to be detected area and a soil landfill area, and each soil storage point is subjected to anti-seepage treatment; meanwhile, after the temporary contaminated soil storage area stores the contaminated soil, the temporary contaminated soil storage area is subjected to capping treatment;
step two soil pretreatment
Carrying out homogenization and screening on the polluted soil through a screening and crushing hopper, and grinding and crushing the arsenic-containing compound agglomerates and the soil in the polluted soil;
step three agent mixing
Adding quicklime into the polluted soil to adjust the pH value of the soil, and adding a stabilizer into the polluted soil.
Mechanical stirring in step four
Sequentially mixing the contaminated soil added with the medicament for three times by using a stirring device;
step five discharge
Discharging the mixed polluted soil by the mobile soil improving machine, and conveying the discharged polluted soil to a soil area to be detected by a dump truck;
step six stacked soil maintenance
Stacking the treated soil in a soil to-be-detected area for maintenance reaction, and accurately controlling the water content of the polluted soil in the maintenance reaction stage;
step seven mud body detection acceptance
Sampling and accepting the contaminated soil after the maintenance reaction, and carrying out the next step after the acceptance reaches the standard; if the acceptance does not reach the standard, repeating the second step to the seventh step until the acceptance reaches the standard;
eight-step soil landfill
And excavating and transporting the polluted soil which meets the acceptance standard to a soil landfill area, and capping after the landfill is finished.
In the second step of soil pretreatment, the screening and crushing hopper grinds and crushes the soil by mechanical force until the particle size of the soil is less than or equal to 4.0 mm.
2. The ex-situ remediation method for the arsenic-contaminated soil as claimed in claim 1, wherein the ex-situ remediation method comprises the following steps: in the seepage prevention of the soil storage points in the step I, leveling and compacting the soil storage points before the seepage prevention treatment until the compaction degree reaches 0.92; prevention of seepage is handled mainly through two cloth membrane structures and is realized, two cloth membrane structures include plain noodles HDPE membrane 1 and protective layer 2, protective layer 2 is provided with two-layerly, and plain noodles HDPE membrane 1 sets up between two-layer protective layer 2.
3. The ex-situ remediation method for the arsenic-contaminated soil as claimed in claim 1, wherein the ex-situ remediation method comprises the following steps: the protective layer 2 comprises long fiber non-woven geotextile 21 and a high density polyethylene film 22, the high density polyethylene film 22 is provided with two layers, and the long fiber non-woven geotextile 21 is arranged between the high density polyethylene films 22.
4. The ex-situ remediation method for the arsenic-contaminated soil as claimed in claim 1, wherein the ex-situ remediation method comprises the following steps: in the step three-agent mixing, the stabilizer contains 8% of Fe-MnO2 powder, 62% of fly ash, 3% of activated carbon, 25% of calcium carbonate and 2% of PAM; the Fe-MnO2 powder had a Fe to Mn ratio of 0.4: 0.6.
5. The ex-situ remediation method for the arsenic-contaminated soil as claimed in claim 1, wherein the ex-situ remediation method comprises the following steps: the step three of mixing the agents, the step four of mechanically stirring and the step five of discharging are operated by a soil improvement machine, and the soil can be restored in different places by utilizing the characteristic of autonomous movement of the soil improvement machine.
6. The ex-situ remediation method for the arsenic-contaminated soil as claimed in claim 1, wherein the ex-situ remediation method comprises the following steps: in the step six stacking soil curing step, the soil moisture content is controlled to be 20-30% in the curing period, and the stacking curing period is 3-7 days.
7. The ex-situ remediation method for the arsenic-contaminated soil as claimed in claim 2, wherein the ex-situ remediation method comprises the following steps: the thickness of the smooth HDPE film 1 is 1.5mm, and the seepage-proofing coefficient of the smooth HDPE film is less than 1.0 multiplied by 10 < -13 > cm/s; the density of the long-fiber non-woven geotextile 21 is 450g/cm2。
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