CN115415298A - Remediation method for arsenic heavy metal contaminated soil - Google Patents
Remediation method for arsenic heavy metal contaminated soil Download PDFInfo
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- CN115415298A CN115415298A CN202211197304.2A CN202211197304A CN115415298A CN 115415298 A CN115415298 A CN 115415298A CN 202211197304 A CN202211197304 A CN 202211197304A CN 115415298 A CN115415298 A CN 115415298A
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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
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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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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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
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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Abstract
The invention discloses a method for restoring arsenic heavy metal contaminated soil, which comprises the following steps: crushing the polluted soil, washing the polluted soil, draining the soil, adjusting acid of the soil, adding the acid adjusting agent, and turning, stirring and mixing; and fertilizing the soil, adding a silicon-calcium-magnesium fertilizer, stirring by using stirring equipment, and maintaining to obtain the repaired soil. Compared with the traditional method for washing the soil polluted by the arsenic heavy metal, the method for repairing the soil polluted by the arsenic heavy metal solves the problem of acidification of the soil, can adjust the acid of the soil, further provides a fertilizer increasing effect for the soil, can provide calcium supplement, potassium supplement, nitrogen supplement and molybdenum supplement for the soil through plant ash, lime, fire manure, ammonium bicarbonate and calcium molybdate, can provide silicon, calcium and magnesium for the soil through a silicon-calcium-magnesium fertilizer, solves the problem of dissolution of the silicon, calcium and magnesium, repairs and protects the soil, and has good economic benefits.
Description
Technical Field
The invention relates to the technical field of remediation of arsenic heavy metal contaminated soil, in particular to a remediation method of arsenic heavy metal contaminated soil.
Background
The soil heavy metal pollutants mainly comprise mercury, cadmium, lead, copper, chromium, arsenic, nickel, iron, manganese, zinc and the like; the arsenic heavy metal enters the soil environment and cannot be directly degraded or naturally decomposed by microorganisms, so that the arsenic heavy metal can exist in the soil environment for a long time and is a potential pollutant. After plants (crops) absorb a certain amount of heavy metals, the growth and development of roots, stems and leaves of the plants are influenced. Heavy metals can also be continuously enriched, concentrated and amplified in the human body through the transmission action of a food chain, and finally harm the health of the human body.
In the prior art, the soil is usually leached by phosphoric acid, arsenic heavy metal is washed out, and the extraction amount of the arsenic heavy metal can reach 99.9%, but the traditional treatment method has the following problems: after treatment, the soil can be acidified; meanwhile, silicon, calcium and magnesium in the soil can be dissolved out of the soil together, so that the content of normal elements in the soil is influenced.
Therefore, the technical personnel in the field provide a remediation method of arsenic heavy metal contaminated soil to solve the problems.
Disclosure of Invention
The invention aims to provide a method for restoring arsenic heavy metal contaminated soil, which can solve soil acidification, can also increase the fertilizer for the soil and can solve the problem that the normal element loss affects the soil.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a remediation method of arsenic heavy metal contaminated soil comprises the following steps:
(1) Soil crushing of the polluted soil: carrying out ploughing and crushing treatment on the polluted soil;
(2) And (3) leaching the polluted soil: spraying the eluting agent into the crushed polluted soil for 4-7 times, and keeping the eluting agent and the soil immersed for 10-30min each time;
(3) Draining of soil: drying the washed soil in the sun and draining until the water content in the soil is between 18 and 20 percent;
(4) Acid regulation of soil: adding an acid regulating agent into the drained soil, and turning, stirring and mixing to obtain mixed treatment soil A;
(5) Soil fertility increasing: and adding a silicon-calcium-magnesium fertilizer into the mixed treatment soil A, turning over, stirring and mixing, and then planting plants for phytoremediation.
Preferably, in the step (1), when the polluted soil is crushed, the crushed soil is screened by using a screening device with a 30-50 mesh screen, and meanwhile, stones and impurities in the soil are manually picked up.
Preferably, in the step (2), the eluting agent is phosphoric acid solution with mass concentration of 5-10%.
Preferably, in the step (3), the acid regulating agent is composed of the following raw materials in parts by weight: 10-20 parts of plant ash, 18-26 parts of lime, 12-20 parts of fire manure, 10-18 parts of ammonium bicarbonate and 10-20 parts of calcium molybdate.
Preferably, in step (4), before the acid adjustment, a PH test instrument is used to detect the PH of the soil.
Preferably, in step (5), the plant is a brassica, a heliopsis and/or a thlaspi.
Preferably, in the step (5), a proper amount of water is required to be added when the silicon-calcium-magnesium fertilizer is added, so that the humidity is ensured to be 5-30%.
The principle of the remediation method of the arsenic heavy metal contaminated soil disclosed by the invention is as follows: the plant ash, lime, fire manure, ammonium bicarbonate and calcium molybdate can provide acid for soil, can provide calcium supplement, potassium supplement, nitrogen supplement and molybdenum supplement for soil, and can further provide silicon, calcium and magnesium for soil through silicon-calcium-magnesium fertilizer, so that the problem of dissolution of silicon, calcium and magnesium is solved, and the soil is protected; and then effectively repairing the soil by planting brassica, heliotropium and/or Thalassia plants.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) Compared with the traditional method for washing the soil by phosphoric acid and washing out the arsenic heavy metal, the method for restoring the soil polluted by the arsenic heavy metal solves the problem of acidification of the soil, can adjust the acid for the soil and further provides a fertility-increasing effect for the soil;
(2) The plant ash, lime, fire manure, ammonium bicarbonate and calcium molybdate can provide calcium supplement, potassium supplement, nitrogen supplement and molybdenum supplement for soil, and silicon, calcium and magnesium can be further provided for soil through silicon-calcium-magnesium fertilizer, so that the problem of dissolution of silicon, calcium and magnesium is solved, and the soil is protected.
(3) The method is characterized in that brassica, brassica and/or Thalassia plants are planted after soil is fertilized, and the plants absorb, decompose and convert arsenic heavy metals, so that the polluted soil is effectively repaired, the repair cost is low, and the method has good economic benefit.
Drawings
FIG. 1 is a schematic flow chart of the remediation method of arsenic heavy metal contaminated soil.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
FIG. 1 is a schematic flow chart of the present invention.
Example 1
A remediation method of arsenic heavy metal contaminated soil comprises the following steps:
(1) Soil crushing of the polluted soil: carrying out ploughing and crushing treatment on the polluted soil; when the polluted soil is crushed, screening the crushed soil by using screening equipment with a 40-mesh screen, and simultaneously, manually picking out stones and impurities in the soil;
(2) And (3) leaching the polluted soil: spraying 8% phosphoric acid solution into the crushed polluted soil, spraying for 4-7 times, each time of leaching, and keeping the leaching agent and the soil to be soaked for 20min;
(3) Draining of soil: airing and draining the washed soil until the water content in the soil is 18%;
(4) Acid regulation of soil: in the drained soil, detecting the pH value of the soil by using a pH testing instrument, adding an acid regulating agent, and turning, stirring and mixing to obtain mixed treatment soil A; the acid regulating agent is prepared from the following raw materials in parts by weight: 15 parts of plant ash, 20 parts of lime, 18 parts of fire manure, 13 parts of ammonium bicarbonate and 15 parts of calcium molybdate;
(5) Soil fertility increasing: adding silicon-calcium-magnesium fertilizer into the mixed treated soil A, and simultaneously adding a proper amount of water to ensure that the humidity is 20%; the method comprises the steps of turning over, stirring and mixing, and then planting brassica oleracea for plant restoration.
Example 2
A remediation method of arsenic heavy metal contaminated soil comprises the following steps:
(1) Soil crushing of the contaminated soil: carrying out ploughing and crushing treatment on the polluted soil; when the polluted soil is crushed, screening the crushed soil by using screening equipment with a 30-mesh screen, and simultaneously manually picking out stones and impurities in the soil;
(2) And (3) leaching the polluted soil: spraying 5% phosphoric acid solution into the crushed polluted soil, spraying for 4-7 times, each time leaching, and keeping leaching agent and soil phase leaching for 10min;
(3) Draining of soil: airing and draining the washed soil until the water content in the soil is 20%;
(4) Acid regulation of soil: in the drained soil, detecting the pH value of the soil by using a pH testing instrument, adding an acid regulating agent, and turning, stirring and mixing to obtain mixed treatment soil A; the acid regulating agent is prepared from the following raw materials in parts by weight: 10 parts of plant ash, 18 parts of lime, 12 parts of fire manure, 10 parts of ammonium bicarbonate and 10 parts of calcium molybdate;
(5) Soil fertility increasing: adding silicon-calcium-magnesium fertilizer into the mixed treated soil A, and simultaneously adding a proper amount of water to ensure that the humidity is 5%; the method comprises the steps of ploughing, stirring and mixing, and then planting the Brassica oleracea of the genus Brassica to repair plants.
Example 3
A remediation method of arsenic heavy metal contaminated soil comprises the following steps:
(1) Soil crushing of the polluted soil: carrying out ploughing and crushing treatment on the polluted soil; when the polluted soil is crushed, screening the crushed soil by using screening equipment with a 40-mesh screen, and simultaneously manually picking out stones and impurities in the soil;
(2) And (3) leaching the polluted soil: spraying 8% phosphoric acid solution into the crushed polluted soil, spraying for 4-7 times, each time leaching, and keeping the leaching agent and the soil to be soaked for 20min;
(3) Draining of soil: airing and draining the washed soil until the water content in the soil is 18%;
(4) Acid regulation of soil: in the drained soil, detecting the pH value of the soil by using a pH testing instrument, adding an acid regulating agent, and turning, stirring and mixing to obtain mixed treatment soil A; the acid regulating agent is prepared from the following raw materials in parts by weight: 20 parts of plant ash, 26 parts of lime, 20 parts of fire manure, 18 parts of ammonium bicarbonate and 20 parts of calcium molybdate;
(5) Soil fertility increasing: adding silicon-calcium-magnesium fertilizer into the mixed treated soil A, and simultaneously adding a proper amount of water to ensure that the humidity is 30%; the method comprises the steps of ploughing, stirring and mixing, and then planting the Brassica oleracea of the genus Brassica to repair plants.
Example 4
A remediation method of arsenic heavy metal contaminated soil comprises the following steps:
(1) Soil crushing of the contaminated soil: carrying out ploughing and crushing treatment on the polluted soil; when the polluted soil is crushed, screening the crushed soil by using screening equipment with a 50-mesh screen, and simultaneously manually picking out stones and impurities in the soil;
(2) And (3) leaching the polluted soil: spraying 10% phosphoric acid solution into the crushed polluted soil, spraying for 4-7 times, each time of leaching, and keeping the leaching agent and the soil to be soaked for 30min;
(3) Draining of soil: drying the washed soil in the sun and draining until the water content in the soil is 20%;
(4) Acid regulation of soil: in the drained soil, detecting the pH value of the soil by using a pH testing instrument, adding an acid regulating agent, and turning, stirring and mixing to obtain mixed treatment soil A; the acid regulating agent is prepared from the following raw materials in parts by weight: 20 parts of plant ash, 26 parts of lime, 20 parts of fire manure, 18 parts of ammonium bicarbonate and 20 parts of calcium molybdate;
(5) Soil fertility increasing: adding silicon-calcium-magnesium fertilizer into the mixed treated soil A, and simultaneously adding a proper amount of water to ensure that the humidity is 30%; by ploughing, stirring and mixing, then planting Brassica oleracea of Brassica and performing phytoremediation.
Comparative example 1
The present example is identical to the other process steps of example 1, except that: the step of washing the contaminated soil is not performed.
Comparative example 2
The present example is consistent with the other process steps of example 1, except that: the soil conditioning step was not performed.
Comparative example 3
The present example is identical to the other process steps of example 1, except that: after the soil is fertilized, the step of phytoremediation is not carried out.
The soils to be remediated were remediated by the methods of examples 1 to 4 and comparative examples 1 to 3, respectively, and the arsenic removal rate of the remediated soils was measured and calculated, and the results are shown in table 1.
TABLE 1
As can be seen from Table 1, the arsenic removal rate of the method of the embodiment 1 can reach 82.2% at most, which is significantly higher than that of the steps of the comparative examples 1-3, such as the step of washing the soil without pollution. The method for repairing the arsenic heavy metal polluted soil solves the problem of arsenic heavy metal pollution of the soil, and has low repairing cost and good economic benefit.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (7)
1. The method for repairing the arsenic heavy metal contaminated soil is characterized by comprising the following steps: the repairing method comprises the following steps:
(1) Soil crushing of the contaminated soil: carrying out ploughing and crushing treatment on the polluted soil;
(2) And (3) leaching the polluted soil: spraying the eluting agent into the crushed polluted soil for 4-7 times, and keeping the eluting agent and the soil immersed for 10-30min each time;
(3) Draining of soil: drying the washed soil in the sun and draining until the water content in the soil is between 18 and 20 percent;
(4) Acid regulation of soil: adding an acid regulating agent into the drained soil, and turning, stirring and mixing to obtain mixed treatment soil A;
(5) Soil fertility increasing: and adding a silicon-calcium-magnesium fertilizer into the mixed treatment soil A, turning over, stirring and mixing, and then planting plants for phytoremediation.
2. The method for remediating arsenic heavy metal contaminated soil as claimed in claim 1, wherein the method comprises the following steps: in the step (1), when the polluted soil is crushed, screening the crushed soil by using screening equipment with a 30-50-mesh screen, and simultaneously manually picking out stones and impurities in the soil.
3. The method for remediating arsenic heavy metal contaminated soil as claimed in claim 1, wherein the method comprises the following steps: in the step (2), the eluting agent is phosphoric acid solution with the mass concentration of 5-10%.
4. The method for remediating arsenic heavy metal contaminated soil as claimed in claim 1, wherein the method comprises the following steps: in the step (3), the acid regulating agent is prepared from the following raw materials in parts by weight: 10-20 parts of plant ash, 18-26 parts of lime, 12-20 parts of fire manure, 10-18 parts of ammonium bicarbonate and 10-20 parts of calcium molybdate.
5. The method for remediating arsenic heavy metal contaminated soil as claimed in claim 1, wherein the method comprises the following steps: in the step (4), a pH tester is required to detect the pH value of the soil before adjusting the acid.
6. The method for remediating arsenic heavy metal contaminated soil as claimed in claim 6, wherein the method comprises the following steps: in step (5), the plant is Brassica, brassica and/or Thalassina.
7. The method for remediating arsenic heavy metal contaminated soil as claimed in claim 1, wherein the method comprises the following steps: in the step (5), a proper amount of water is required to be added when the silicon-calcium-magnesium fertilizer is added, and the humidity is ensured to be 5-30%.
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Citations (7)
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| EP3815803A1 (en) * | 2019-11-04 | 2021-05-05 | Corigin International Institute | Soil restoration method and structure |
-
2022
- 2022-09-29 CN CN202211197304.2A patent/CN115415298A/en active Pending
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Non-Patent Citations (1)
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