CN110624946B - Method for removing heavy metal pollutants in soil - Google Patents
Method for removing heavy metal pollutants in soil Download PDFInfo
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- CN110624946B CN110624946B CN201911067931.2A CN201911067931A CN110624946B CN 110624946 B CN110624946 B CN 110624946B CN 201911067931 A CN201911067931 A CN 201911067931A CN 110624946 B CN110624946 B CN 110624946B
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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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Abstract
The invention relates to the technical field of soil remediation, and discloses a method for removing heavy metal pollutants in soil, which comprises the following steps: s1, dissolving potassium carbonate into cold water to prepare a solution with the concentration of 5-10%, and spraying the solution on soil; s2, dissolving EDTMPA in the hot solution to prepare a solution with the concentration of 2-5%; s3, dissolving EDTMPA in ammonia water to prepare a solution with the concentration of 2-5%; and S4, S1, spraying the solution A by using spraying equipment after 7 days, sampling and analyzing the pH value, stopping spraying the solution A when the pH value reaches 6.5-7, sampling and analyzing the content of heavy metals, and continuing spraying the solution B if the content of the heavy metals exceeds the standard. The soil repaired by the method not only removes the heavy metal pollution, but also provides nitrogen, phosphorus and potassium elements required by the growth of crops, promotes the growth of plants, is convenient for the recovery of later-period soil vegetation, and has the advantages of short treatment time, low cost, convenient operation, easily purchased raw materials, wide application range and good treatment effect.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a method for removing heavy metal pollutants in soil.
Background
The soil remediation is a technical measure for restoring the normal function of polluted soil, in the soil remediation industry, the existing soil remediation technology reaches more than one hundred, the common technologies are more than ten, and can be roughly divided into three methods, namely a physical method, a chemical method and a biological method, and since the 80 th century, many countries in the world, especially developed countries, make and develop polluted soil treatment and remediation plans, so that a new soil remediation industry is formed, wherein the chemical remediation method is to add an improver into the soil, and the biological effectiveness of heavy metals is reduced through the adsorption, redox, antagonism or precipitation effect on the heavy metals. The method is characterized in that an economical and effective modifying agent is selected, the commonly used modifying agent comprises lime, zeolite, calcium carbonate, phosphate, silicate and organic substances for promoting reduction, different modifying agents have different action mechanisms on heavy metals, and the lime or calcium carbonate is mainly used for improving the pH value of soil and promoting elements such as Cd, Cu, Hg, Zn and the like in the soil to form hydroxide or carbonate combined salt precipitates. For example, when the soil pH is >6.5, Hg can form hydroxide or carbonate precipitates. Experiments show that under the low lime level, hydroxyl and carboxyl of soil organic matters react with OH < - >, so that the variable charge of the soil is increased, the heavy metals in an organic combination state are increased, and Cd2 < + > is combined with CO2 < -3 > to generate CdCO3 which is difficult to dissolve in water.
The existing traditional chemical method soil remediation technology cannot simultaneously add nitrogen, phosphorus and potassium elements into the treated soil, is not beneficial to the growth of plants, and has long treatment time and poor treatment effect. Accordingly, one skilled in the art provides a method for removing heavy metal pollutants from soil to solve the problems set forth in the background art.
Invention inner solution
The invention aims to provide a method for removing heavy metal pollutants in soil, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for removing heavy metal pollutants in soil comprises the following steps:
s1, dissolving potassium carbonate by using cold water to prepare a solution with the concentration of 5% -10%, then selecting appropriate spraying equipment according to the area of soil to be treated, using a high-pressure water pump to treat the large area, spraying water by atomizing a nozzle, spraying an agricultural sprayer to treat the small area, sampling and testing the pH value of the soil after spraying for the first time and 24 hours, controlling the pH value of the soil to be between 8 and 10, and continuing spraying the potassium carbonate solution until the pH value is between 8 and 10 if the pH value does not reach 8;
s2, dissolving EDTMPA in the hot solution to prepare a solution with the concentration of 2-5%, adding sophorolipid with the concentration of one thousandth into the solution, and uniformly stirring to obtain an A solution for later use;
s3, dissolving EDTMPA in ammonia water to prepare a solution with the concentration of 2% -5%, wherein the pH value of the solution is controlled to be 6.5-7, adding sophorolipid with the concentration of one thousandth into the solution, and uniformly stirring to obtain a solution B for later use;
and S4, S1, spraying the solution A by using spraying equipment after 7 days, sampling and analyzing the pH value, stopping spraying the solution A when the pH value reaches 6.5-7, sampling and analyzing the content of heavy metals, continuing spraying the solution B if the content of the heavy metals exceeds the standard, continuing sampling and analyzing the content of the heavy metals after 24 hours, and continuing spraying the solution B for 3 times if the content of the heavy metals does not reach the standard until the solution is qualified.
As a still further scheme of the invention: the potassium carbonate is used as a soil loosening agent, is used for improving the pH value of soil, can generate insoluble substances with partial heavy metal ions, and provides potassium nutrients for the soil.
As a still further scheme of the invention: the sophorolipid can be used as a biosurfactant, and can improve the treatment effect of the polluted soil.
As a still further scheme of the invention: the ethylenediaminetetramethylenephosphonic acid (EDTMPA) is used as a chelating agent for extracting heavy metals from soil and providing phosphorus and nitrogen nutrients to crops.
Compared with the prior art, the invention has the beneficial effects that:
the soil repaired by the method not only removes the heavy metal pollution, but also provides nitrogen, phosphorus and potassium elements required by the growth of crops, promotes the growth of plants, is convenient for the recovery of soil vegetation in the later period, and has the advantages of short treatment time, low cost, convenient operation, easily purchased raw materials, wide application range, good treatment effect and high safety.
Drawings
FIG. 1 is a schematic flow diagram of a method for removing heavy metal contaminants from soil;
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, a method for removing heavy metal pollutants in soil includes the following steps:
s1, dissolving potassium carbonate by using cold water to prepare a solution with the concentration of 5% -10%, then selecting appropriate spraying equipment according to the area of soil to be treated, using a high-pressure water pump to treat the large area, spraying water by atomizing a nozzle, spraying an agricultural sprayer to treat the small area, sampling and testing the pH value of the soil after spraying for the first time and 24 hours, controlling the pH value of the soil to be between 8 and 10, and continuing spraying the potassium carbonate solution until the pH value is between 8 and 10 if the pH value does not reach 8;
s2, dissolving EDTMPA in the hot solution to prepare a solution with the concentration of 2-5%, adding sophorolipid with the concentration of one thousandth into the solution, and uniformly stirring to obtain an A solution for later use;
s3, dissolving EDTMPA in ammonia water to prepare a solution with the concentration of 2% -5%, wherein the pH value of the solution is controlled to be 6.5-7, adding sophorolipid with the concentration of one thousandth into the solution, and uniformly stirring to obtain a solution B for later use;
and S4, S1, spraying the solution A by using spraying equipment after 7 days, sampling and analyzing the pH value, stopping spraying the solution A when the pH value reaches 6.5-7, sampling and analyzing the content of heavy metals, continuing spraying the solution B if the content of the heavy metals exceeds the standard, continuing sampling and analyzing the content of the heavy metals after 24 hours, and continuing spraying the solution B for 3 times if the content of the heavy metals does not reach the standard until the solution is qualified.
The potassium carbonate is used as a soil loosening agent, is used for improving the pH value of soil, can generate insoluble substances with partial heavy metal ions, and provides potassium nutrients for the soil.
Sophorolipid is used as a biosurfactant for eluting heavy metals in soil, thereby improving the treatment effect of polluted soil, has the general performances of solubilization, emulsification, wetting, foaming, dispersion, surface tension reduction and the like of the conventional surfactant, has the characteristics of no toxicity, 100 percent biodegradability, temperature resistance, high salt resistance, wide pH range adaptation range, environmental friendliness and the like, can partially or completely replace a chemically synthesized surfactant for use, and can loosen soil.
Ethylenediamine tetra methylene phosphonic acid (EDTMPA) is used as a chelating agent for extracting heavy metals in soil and providing phosphorus and nitrogen nutrients for crops, the EDTMPA is a high-purity reagent and is non-toxic, contains 78% of phosphorus and a small amount of nitrogen and can be slowly released in the soil, and the chelating agent can also be HEDP, ATMP or DTPMPA, is not limited as long as the EDTMPA can provide the phosphorus and nitrogen nutrients and is non-toxic and harmless.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (4)
1. A method for removing heavy metal pollutants in soil is characterized by comprising the following steps:
s1, dissolving potassium carbonate by using cold water to prepare a solution with the concentration of 5% -10%, then selecting appropriate spraying equipment according to the area of soil to be treated, using a high-pressure water pump to treat the large area, spraying water by atomizing a nozzle, spraying an agricultural sprayer to treat the small area, sampling and testing the pH value of the soil after spraying for the first time and 24 hours, controlling the pH value of the soil to be between 8 and 10, and continuing spraying the potassium carbonate solution until the pH value is between 8 and 10 if the pH value does not reach 8;
s2, dissolving EDTMPA in the hot solution to prepare a solution with the concentration of 2-5%, adding sophorolipid with the concentration of one thousandth into the solution, and uniformly stirring to obtain an A solution for later use;
s3, dissolving EDTMPA in ammonia water to prepare a solution with the concentration of 2% -5%, wherein the pH value of the solution is controlled to be 6.5-7, adding sophorolipid with the concentration of one thousandth into the solution, and uniformly stirring to obtain a solution B for later use;
and S4, S1, spraying the solution A by using spraying equipment after 7 days, sampling and analyzing the pH value, stopping spraying the solution A when the pH value reaches 6.5-7, sampling and analyzing the content of heavy metals, continuing spraying the solution B if the content of the heavy metals exceeds the standard, continuing sampling and analyzing the content of the heavy metals after 24 hours, and continuing spraying the solution B for 3 times if the content of the heavy metals does not reach the standard until the solution is qualified.
2. The method for removing heavy metal pollutants in soil according to claim 1, wherein the potassium carbonate is used as a soil loosening agent for increasing the pH value of the soil, and can generate carbonate insolubles and hydroxide insolubles with part of heavy metal ions, and further provide potassium nutrients for the soil.
3. The method as claimed in claim 1, wherein the sophorolipid is used as a biosurfactant.
4. The method of claim 1, wherein the ethylenediaminetetraacetic acid (EDTMPA) is used as a chelating agent for extracting heavy metals from soil, and provides phosphorus and nitrogen nutrients to crops.
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| CN112792115A (en) * | 2020-12-28 | 2021-05-14 | 四川蓝本数字建造科技有限公司 | Method for removing heavy metal pollutants in soil by using amino trimethylene phosphonic acid and application |
| CN114184752A (en) * | 2021-11-11 | 2022-03-15 | 深圳市宇驰检测技术股份有限公司 | Heavy metal pollutant resistance control device and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706627A (en) * | 2013-12-17 | 2014-04-09 | 辽宁石油化工大学 | Method for restoring chromium contaminated soil through EDTMPA (ethylenediamine tetra methylenephosphonic acid) |
| CN106216379A (en) * | 2016-09-05 | 2016-12-14 | 华中科技大学 | A kind of comprehensive leaching repairing method of heavy-metal contaminated soil and system |
| CN107365585A (en) * | 2016-05-12 | 2017-11-21 | 南京凯杰环境技术有限公司 | A kind of environmentally friendly cadmium metal contaminated soil eluent and preparation method thereof |
| CN110369478A (en) * | 2018-04-13 | 2019-10-25 | 陈淡宁 | The method for comprehensive repairing of heavy-metal contaminated soil |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706627A (en) * | 2013-12-17 | 2014-04-09 | 辽宁石油化工大学 | Method for restoring chromium contaminated soil through EDTMPA (ethylenediamine tetra methylenephosphonic acid) |
| CN107365585A (en) * | 2016-05-12 | 2017-11-21 | 南京凯杰环境技术有限公司 | A kind of environmentally friendly cadmium metal contaminated soil eluent and preparation method thereof |
| CN106216379A (en) * | 2016-09-05 | 2016-12-14 | 华中科技大学 | A kind of comprehensive leaching repairing method of heavy-metal contaminated soil and system |
| CN110369478A (en) * | 2018-04-13 | 2019-10-25 | 陈淡宁 | The method for comprehensive repairing of heavy-metal contaminated soil |
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