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Oxyanion type heavy metal contaminated soil stabilization remediation agent and soil remediation method

A polluted soil, anionic technology, applied in the field of soil remediation, can solve problems such as rebound, reduction of repair effect, and inability to ensure long-term repair effect, so as to reduce costs and avoid water absorption and agglomeration

Active Publication Date: 2020-05-05
HUNAN JINLV ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the remediation effect of using iron-based materials to remediate oxyanion-type heavy metal-contaminated soil will gradually decrease with the oxidation of the compounds formed by iron-based materials, and even rebound phenomenon, which cannot ensure the long-term remediation effect

Method used

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  • Oxyanion type heavy metal contaminated soil stabilization remediation agent and soil remediation method
  • Oxyanion type heavy metal contaminated soil stabilization remediation agent and soil remediation method
  • Oxyanion type heavy metal contaminated soil stabilization remediation agent and soil remediation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This example provides a kind of oxygen-containing anion type heavy metal polluted soil stabilizing restoration agent, comprises solid powder agent A and liquid agent B; Solid powder agent A comprises the preparation raw material of following weight part:

[0042] Hydrotalcite: 10-30 parts, calcium-based bentonite: 40-60 parts, alumina: 5-15 parts, magnesium oxide: 5-15 parts;

[0043]Liquid agent B is a solution of soluble zirconium salt.

[0044] Wherein, the hydrotalcite-like is a hydrotalcite-like modified by nanometer zero-valent iron. The preparation method of nano-zero-valent iron-modified hydrotalcite-like materials is as follows: hydrotalcite powder with a particle size of 100 mesh and 0.02mol / L FeSO 4 The solution is in an inert gas N with a solid-to-liquid ratio of 1:5 2 Mixed and stirred for 15 min under the protection of the mixture, and then centrifuged to separate the solid part. Then the separated solid part is mixed and stirred with deionized water-et...

Embodiment 2

[0047] This example provides the soil remediation method using the oxygen-containing anion type heavy metal polluted soil stabilization and remediation agent of embodiment 1, and the flow process is as follows figure 1 As shown, the steps include:

[0048] S1: Crushing the polluted soil, adjusting the water content of the polluted soil to the first moisture content;

[0049] S2: mixing the solid powder agent A with the soil treated in step S1;

[0050] S3: Spray the liquid agent B into the soil treated in step S2 until the moisture in the contaminated soil reaches the second moisture content;

[0051] S4: The soil treated in step S3 is covered with a film and then maintained.

[0052] In step S1, the particle size of the crushed soil is ≤3cm. The first water content is 25-30%.

[0053] In addition to crushing the contaminated soil and adjusting the water content of the contaminated soil, it is necessary to remove the impurities in the soil in order to make the remediation ...

Embodiment 3

[0059] In this example, the remediation agent of Example 1 and the remediation method of Example 2 were used to treat the contaminated soil. Details are as follows:

[0060] The contaminated soil was taken from the Lengshuijiang tin mine, and the main pollution factors were antimony and arsenic. After detection and analysis, it can be seen that the basic properties of the polluted soil are shown in Table 1.

[0061] Table 1 Basic properties of polluted soil

[0062]

[0063] Steps include:

[0064] (1) Take 1 kg of the above-mentioned polluted soil for pretreatment. The pretreatment includes air-drying, crushing, and sieving, so that the particle size of the pretreated soil is less than or equal to 3 cm, and the moisture content is kept at about 30%. At the same time, samples were taken and analyzed to detect the basic properties of the polluted soil (the test results are shown in Table 1).

[0065] (2) According to the basic properties of the polluted soil shown in Tab...

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Abstract

The embodiment of the invention provides an oxyanion type heavy metal contaminated soil stabilization remediation agent and a soil remediation method. The remediation agent can be used for rapidly, efficiently and permanently stabilizing oxyanion type heavy metals in soil through multiple ways such as oxidation-reduction, adsorption and chemical precipitation; and compared with a remediation agentof only using an iron-based material for stabilizing treatment, the remediation agent of the invention has a better stabilizing effect and is not easy to rebound.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to an oxygen-containing anion-type heavy metal polluted soil stabilization and remediation agent and a soil remediation method. Background technique [0002] Soil is a vital natural resource to ensure sustainable development, and it is also an important object of ecological and environmental protection. [0003] Common heavy metal pollution elements include cadmium, lead, mercury, arsenic, hexavalent chromium, nickel, etc. Among them, the migration of cadmium, lead, nickel and other elements in soil is mainly in the form of positively charged cations. The migration ability is strong under acidic conditions, and its activity gradually decreases with the increase of pH value. Therefore, the treatment of this type of heavy metal-contaminated soil is usually by adding alkaline oxides to increase the soil pH and forming negatively charged hydroxide colloids for adso...

Claims

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Application Information

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IPC IPC(8): C09K17/08B09C1/08
CPCB09C1/08C09K17/08
Inventor 魏勇红喻海彬黄放李少雄江湛如袁本琦
Owner HUNAN JINLV ENVIRONMENTAL PROTECTION CO LTD
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