CN111922062A - Method for removing heavy metals in soil by soil remediation agent Orient Green - Google Patents
Method for removing heavy metals in soil by soil remediation agent Orient Green Download PDFInfo
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- CN111922062A CN111922062A CN202010730700.1A CN202010730700A CN111922062A CN 111922062 A CN111922062 A CN 111922062A CN 202010730700 A CN202010730700 A CN 202010730700A CN 111922062 A CN111922062 A CN 111922062A
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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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- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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Abstract
The invention discloses a method for removing soil heavy metal by utilizing a soil remediation agent Orient Green, which comprises the following steps: (1) taking the soil polluted by the heavy metal, air-drying the soil, and then sieving the soil by a 2mm sieve to obtain the pretreated soil for later use; (2) adding water into the soil pretreated in the step (1), adjusting the water content of the soil, and stirring uniformly to ensure that the soil is fully contacted with the water; (3) adding an Orient Green repairing agent into the soil treated in the step (2), uniformly stirring, and standing for repairing for 12 hours; (4) and (3) after standing and repairing, sampling and analyzing the heavy metal content in the soil, if the heavy metal content exceeds the standard, continuously adding an organic Green repairing agent into the soil, stirring uniformly, and sampling again and analyzing the heavy metal content in the soil until the repairing reaches the standard. The method for removing the heavy metals in the soil by using the soil remediation agent Orient Green has the advantages of short remediation period, simple method, good remediation effect and low remediation cost.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a method for removing heavy metals in soil by using a soil remediation agent OrientGreen.
Background
With the rapid development of industrial and agricultural in China, the heavy metal pollution of soil becomes a difficult problem to be solved urgently. The heavy metal pollution at present is often the composite heavy metal pollution of two or more than two kinds of heavy metals coexisting. High-concentration heavy metals can harm the growth and development of plants, so that the yield and the quality of grains are reduced, and meanwhile, the heavy metals can generate an enrichment effect through a food chain, so that the health of human beings is seriously threatened.
Essentially, the principle of heavy metal remediation technology can be summarized into two types: (1) directly reducing the concentration of heavy metals in the soil, (2) changing the existing form of the heavy metals in the soil, and reducing the migration capacity and bioavailability of the heavy metals in the environment. The existing soil heavy metal remediation technologies can be roughly divided into three types of methods, namely physical, chemical and biological remediation, wherein the chemical method is more widely applied to soil heavy metal treatment due to the characteristics of simple application method, low cost, relatively short period and the like.
The invention patent with publication number CN110624946A discloses a heavy metal removal method, which comprises the steps of preparing 5-10% potassium carbonate solution by cold water, uniformly spraying the potassium carbonate solution until the pH value of soil is adjusted to 8-10, then preparing solution A and solution B by using 2-5% EDTMPA and sophorolipid respectively, after the pH value of the soil is adjusted for 7 days, uniformly spraying the solution A, stopping spraying and analyzing the heavy metal content of the soil when the pH value of the soil reaches 6.5-7, and continuing spraying the solution B if the content still exceeds the standard until the heavy metal content reaches the standard. The method disclosed in patent CN109396166A comprises the steps of crushing soil to be treated into fine particles, applying mixed repairing agent and phosphoric acid aqueous solution into the soil, applying excrement, earthworms and magnetotactic bacteria into the soil after repairing for 25 days, removing the surface soil after 30 days, and finally maintaining the gramineous plants planted in the treated soil.
The technologies of spraying the chemical repairing agent to the soil to achieve the aim of repairing the soil are various, and although the chemical repairing agent has a good treatment effect on heavy metals, the chemical repairing agent applied by the method generally has the problems of low fixing efficiency, secondary pollution, rebound after heavy metal repair and the like, and the plant and microorganism repairing technology has the defects of long repairing period, complex operation and high cost. Therefore, the development of a repair method with short repair period, simple method, good repair effect and low repair cost is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for removing soil heavy metal by using a soil remediation agent OrientGreen, which overcomes the problems of low fixation efficiency, secondary pollution, rebound after heavy metal remediation and the like of the existing chemical remediation technology, and the defects of long remediation period, complex operation and high cost of the plant and microorganism remediation technology.
The technical problem to be solved by the invention is realized by the following technical scheme:
a method for removing heavy metals in soil by utilizing a soil remediation agent Orient Green comprises the following steps:
(1) taking the soil polluted by the heavy metal, air-drying the soil, and then sieving the soil by a 2mm sieve to obtain the pretreated soil for later use;
(2) adding water into the soil pretreated in the step (1), adjusting the water content of the soil, and stirring uniformly to ensure that the soil is fully contacted with the water;
(3) adding an Orient Green repairing agent into the soil treated in the step (2), uniformly stirring, and standing for repairing for 2-12 h;
(4) and (3) after standing and repairing, sampling and analyzing the heavy metal content in the soil, if the heavy metal content exceeds the standard, continuously adding an organic Green repairing agent into the soil, stirring uniformly, and sampling again and analyzing the heavy metal content in the soil until the repairing reaches the standard.
Preferably, in the above technical solution, the heavy metal in step (1) includes nickel and hexavalent chromium.
Preferably, in the above technical scheme, the water in the step (2) is deionized water, and the water content is adjusted to 100% -120% of the saturated water content of the soil.
Preferably, in the above technical solution, the organic Green repairing agent is an adsorptive chelating agent, has a pH value of 5, and comprises the following components in parts by weight: 58.00 to 67.00 of organic matter, 25.00 to 30.00 of humic acid, 1.50 to 2.50 of nitrogen, 0.05 to 0.10 of phosphorus, 0.10 to 0.15 of potassium and Fe2O5 0.50-1.00。
Preferably, in the above technical solution, the origin Green repairing agent comprises the following components in parts by weight: organic matter 65.29, humic acid 27.79, nitrogen 1.54, phosphorus 0.09, potassium 0.12, Fe2O5 0.9。
Preferably, in the above technical solution, the phosphorus is P2O5The potassium is K2O。
Preferably, in the above technical solution, the Orient Green repairing agent is an adsorptive chelating agent, and the pH value is 5.
Preferably, in the technical scheme, the mass ratio of the Orient Green repairing agent added into the soil to the repaired soil is 1 (20-35).
A soil remediation agent Orient Green comprises the following components in parts by weight: 58.00 to 67.00 of organic matter, 25.00 to 30.00 of humic acid, 1.50 to 2.50 of nitrogen, 0.05 to 0.10 of phosphorus, 0.10 to 0.15 of potassium and Fe2O5 0.50-1.00。
Preferably, in the technical scheme, the soil remediation agent Orient Green comprises the following components in parts by weight: organic matter 65.29, humic acid 27.79, nitrogen 1.54, phosphorus 0.09, potassium 0.12, Fe2O5 0.9。
Preferably, in the above technical solution, the phosphorus is P2O5The potassium is K2O。
Preferably, in the above technical solution, the Orient Green repairing agent is an adsorptive chelating agent, and the pH value is 5.
An application of a soil remediation agent Orient Green in remediation of soil polluted by nickel and/or hexavalent chromium heavy metals.
The technical scheme of the invention has the following beneficial effects:
(1) the Orient Green repairing agent adopted by the invention has high organic matter content, can provide nitrogen, phosphorus and potassium elements required by plant growth, is rich in trace elements (Fe), and has the effects of improving soil fertility and improving soil structure while repairing heavy metal pollution.
(2) The technical method has the characteristics of simple and convenient operation, short treatment period and high heavy metal treatment efficiency (70-80 percent), and is suitable for treating heavy metal pollutants such as large-area nickel, hexavalent chromium and the like.
(3) The method for repairing the heavy metal pollution of the soil by the aid of the Orient Green soil repairing technology is short in period, simple and convenient to operate, good in repairing effect and low in repairing cost.
Drawings
FIG. 1 is an electron microscope scanning SEM image of the soil remediation agent Orient Green of the present invention.
Detailed Description
Specific examples of the invention are described in detail below to facilitate a further understanding of the invention.
All experimental procedures used in the following examples are conventional unless otherwise specified. Wherein the original Green raw materials are all obtained by Beijing Colin Weil environmental protection science and technology, but other materials can be obtained by commercial means.
Example 1
A soil remediation agent, Orient Green, which is an adsorptive chelating agent, is slightly acidic (pH around 5), and comprises the following components (g): organic matter 65.29, humic acid 27.79, nitrogen (N)1.54, phosphorus (P)2O5)0.09, Potassium (K)2O)0.12，Fe2O50.9。
The method for removing heavy metal pollution in soil by utilizing the soil remediation agent Orient Green comprises the following steps:
(1) air-drying the soil polluted by the heavy metal, and sieving the soil by a 2mm sieve to obtain pretreated soil;
(2) taking 50g of the soil pretreated in the step (1), adding deionized water, respectively adjusting the water content of the soil to be 100% of the saturated water content of the soil, and simultaneously stirring uniformly to ensure that the soil is fully contacted with water;
(3) and (3) adding 2.5g of an Orient Green repairing agent into the soil treated in the step (2), wherein the mass ratio of the Orient Green repairing agent to the soil to be repaired is 1: 20. Shaking for 2h to mix the soil and the Orient Green remediation agent, standing, and remedying for 7 h;
(4) and (3) sampling and analyzing the heavy metal content in the soil after 12 hours, if the heavy metal content exceeds the standard, continuously adding an organic Green repairing agent into the soil, uniformly stirring, and continuously sampling and analyzing the heavy metal content of the soil until the repairing reaches the standard.
Example 2
A soil remediation agent, Orient Green, which is an adsorptive chelating agent, is slightly acidic (pH around 5), and comprises the following components (g): organic matter 58, humic acid 30, nitrogen (N)1.50, phosphorus (P)2O5)0.10, potassium (K)2O)0.10，Fe2O5 1.00。
The method for removing heavy metal pollution in soil by utilizing the soil remediation agent Orient Green comprises the following steps:
(1) air-drying the soil polluted by the heavy metal, and sieving the soil by a 2mm sieve to obtain pretreated soil;
(2) taking 50g of the soil pretreated in the step (1), adding deionized water, respectively adjusting the water content of the soil to 120% of the saturated water content of the soil, and simultaneously stirring uniformly to ensure that the soil is fully contacted with water;
(3) and (3) adding 2.5g of an Orient Green repairing agent into the soil treated in the step (2), wherein the mass ratio of the Orient Green repairing agent to the soil to be repaired is 1: 20. Shaking for 2h to mix the soil and the Orient Green remediation agent, standing, and remedying for 2 h;
(4) and (3) sampling and analyzing the heavy metal content in the soil after 12 hours, if the heavy metal content exceeds the standard, continuously adding an organic Green repairing agent into the soil, uniformly stirring, and continuously sampling and analyzing the heavy metal content of the soil until the repairing reaches the standard.
Example 3
A soil remediation agent, Orient Green, which is an adsorptive chelating agent, is slightly acidic (pH around 5), and comprises the following components (g): 67.00 of organic matter, 25.00 of humic acid, 2.50 of nitrogen (N) and phosphorus (P)2O5)0.05, potassium (K)2O)0.15，Fe2O50.50。
The method for removing heavy metal pollution in soil by utilizing the soil remediation agent Orient Green comprises the following steps:
(1) air-drying the soil polluted by the heavy metal, and sieving the soil by a 2mm sieve to obtain pretreated soil;
(2) taking 50g of the soil pretreated in the step (1), adding deionized water, respectively adjusting the water content of the soil to be 100% of the saturated water content of the soil, and simultaneously stirring uniformly to ensure that the soil is fully contacted with water;
(3) adding 2.5g of an Orient Green restoration agent into the soil treated in the step (2), oscillating for 2 hours to mix the soil and the Orient Green restoration agent, standing, and restoring for 12 hours;
(4) and (3) respectively sampling and analyzing the heavy metal content in the soil after 12 hours, if the heavy metal content exceeds the standard, continuously adding an organic Green repairing agent into the soil, uniformly stirring, and continuously sampling and analyzing the heavy metal content of the soil until the repairing reaches the standard.
Example 4
A soil remediation agent, Orient Green, which is an adsorptive chelating agent, is slightly acidic (pH around 5), and comprises the following components (g): 66.00 of organic matter, 27.00 of humic acid, 2.00 of nitrogen (N) and 2.00 of phosphorus (P)2O5)0.07, Potassium (K)2O)0.15，Fe2O50.6。
The method for removing heavy metal pollution in soil by utilizing the soil remediation agent Orient Green comprises the following steps:
(1) air-drying the soil polluted by the heavy metal, and sieving the soil by a 2mm sieve to obtain pretreated soil;
(2) taking 50g of the soil pretreated in the step (1), adding deionized water, respectively adjusting the water content of the soil to be 100% of the saturated water content of the soil, and simultaneously stirring uniformly to ensure that the soil is fully contacted with water;
(3) adding 1.4g of an Orient Green restoration agent into the soil treated in the step (2), oscillating for 2 hours to mix the soil and the Orient Green restoration agent, standing, and restoring for 10 hours;
(4) and (3) respectively sampling and analyzing the heavy metal content in the soil after 12 hours, if the heavy metal content exceeds the standard, continuously adding an organic Green repairing agent into the soil, uniformly stirring, and continuously sampling and analyzing the heavy metal content of the soil until the repairing reaches the standard.
The experimental data in the above examples were determined using the following instruments and methods:
(1) and (3) observing the surface morphology phenomenon of the material: scanning electron microscope-SEM.
(2) And (3) absorbance observation: examples samples were placed in a dark room and observed under uv light at 540nm (hexavalent chromium) and 530nm (nickel), respectively.
It can be directly observed from the scanning electron micrograph (as shown in figure 1): the microstructure of the soil remediation agent Orient Green has smooth edges, is formed by stacking a plurality of smaller lamellar structures, and has a plurality of pores and grooves between layers, which shows that the Orient Green has better adsorption performance and sufficient space for adsorbing pollutants such as heavy metal, and the like, and is more beneficial to application of soil heavy metal remediation.
According to the soil environment quality standard (GB 15618-2008), the second-level standard value of the inorganic pollutant nickel in the soil of the agricultural land is 90mg/kg (pH is greater than 7), the second-level standard value of the hexavalent chromium is 5.0mg/kg (residential land), and the effect of the method for treating the soil polluted by the heavy metal in the embodiments 1-4 of the invention is evaluated and checked from the final content (mg/kg) of the heavy metal, as shown in the table 1:
TABLE 1 remediation Effect of heavy Metal contaminated soil
As can be seen from Table 1, in examples 1-4, the contents of the heavy metals in the soil after 2-12h restoration are all below the national soil environment quality standard value, the restoration of the heavy metals in the soil can be completed in a short time, the restoration efficiency is high, and the operation process is simple and convenient.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited thereto, and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (10)
1. A method for removing heavy metals in soil by utilizing a soil remediation agent Orient Green is characterized by comprising the following steps:
(1) taking the soil polluted by the heavy metal, air-drying the soil, and then sieving the soil by a 2mm sieve to obtain the pretreated soil for later use;
(2) adding water into the soil pretreated in the step (1), adjusting the water content of the soil, and stirring uniformly to ensure that the soil is fully contacted with the water;
(3) adding an Orient Green repairing agent into the soil treated in the step (2), uniformly stirring, and standing for repairing for 2-12 h;
(4) and (3) after standing and repairing, sampling and analyzing the heavy metal content in the soil, if the heavy metal content exceeds the standard, continuously adding an organic Green repairing agent into the soil, stirring uniformly, and sampling again and analyzing the heavy metal content in the soil until the repairing reaches the standard.
2. The method for removing heavy metals in soil by using soil remediation agent OrientGreen as claimed in claim 1, wherein the heavy metals in step (1) are nickel and/or hexavalent chromium; and (3) the water in the step (2) is deionized water, and the water content is adjusted to be 100-120% of the saturated water content of the soil.
3. The method of claim 1, wherein the soil remediation agent is an adsorptive chelating agent with a pH of 5, and comprises the following components in parts by weight: 58.00 to 67.00 of organic matter, 25.00 to 30.00 of humic acid, 1.50 to 2.50 of nitrogen, 0.05 to 0.10 of phosphorus, 0.10 to 0.15 of potassium and Fe2O50.50-1.00。
4. The method of claim 3, wherein the soil remediation agent is an adsorptive chelating agent with a pH of 5, and comprises the following components in parts by weight: organic matter 65.29, humic acid 27.79, nitrogen 1.54, phosphorus 0.09, potassium 0.12, Fe2O5 0.9。
5. The method of claim 4, wherein said phosphorus is P and the soil heavy metal is removed by using Orient Green as soil remediation agent2O5The potassium is K2O; the mass ratio of the added soil remediation agent Orient Green to the soil to be remediated is 1 (20-35).
6. The soil remediation agent Orient Green is characterized by comprising the following components in parts by weight: 58.00 to 67.00 of organic matter, 25.00 to 30.00 of humic acid, 1.50 to 2.50 of nitrogen, 0.05 to 0.10 of phosphorus, 0.10 to 0.15 of potassium and Fe2O5 0.50-1.00。
7. The soil remediation agent, Orient Green, of claim 6, comprising in parts by weight: organic matter 65.29, humic acid 27.79, nitrogen 1.54, phosphorus 0.09, potassium 0.12, Fe2O5 0.9。
8. The soil remediation agent, Orient Green, as claimed in claim 1, wherein said phosphorus is P2O5The potassium is K2O。
9. The soil remediation agent, Orient Green, as claimed in claim 1, wherein said Orient Green remediation agent is an adsorptive chelating agent at a pH of 5.
10. The use of the soil remediation agent, Orient Green, according to any one of claims 6 to 9 in the remediation of heavy metal contaminated soil with nickel and/or hexavalent chromium.
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Application publication date: 20201113 |