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Reductive and degradable stabilizer for polluted soil, bottom mud and sludge, preparation method and application method thereof

A technology of polluted soil and stabilizer, applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the lack of heavy metal and organic stabilizers, reduce the ratio of stabilizer addition, and cannot change the total amount of pollutants and other problems, to achieve excellent stabilization effect, reduce leaching toxicity, and facilitate subsequent processing and utilization

Active Publication Date: 2016-04-13
付融冰
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] As mentioned above, although a variety of heavy metal stabilizers for polluted soils have been disclosed in the prior art and have achieved different effects, the treatment objects of these stabilizers are all heavy metals in soil, bottom mud or sludge, and the application Stabilizers for heavy metals and organics and their combined pollution in these media are still lacking
[0023] In these stabilization technologies, although the leaching toxicity of pollutants is reduced from the perspective of risk, the total amount of pollutants in soil, sediment or sludge cannot be changed, which contradicts the soil environmental quality standards. Therefore, the development of Heavy metals are reductively stable and degradable stabilizers for organic matter. It is a cutting-edge technology in this field and has great application prospects and promotion value.

Method used

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  • Reductive and degradable stabilizer for polluted soil, bottom mud and sludge, preparation method and application method thereof
  • Reductive and degradable stabilizer for polluted soil, bottom mud and sludge, preparation method and application method thereof
  • Reductive and degradable stabilizer for polluted soil, bottom mud and sludge, preparation method and application method thereof

Examples

Experimental program
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Effect test

preparation example 1

[0074] Preparation Example 1: Preparation of Loaded Clay Minerals

[0075] Soak sepiolite with 1mol / L hydrochloric acid aqueous solution, then rinse with deionized water until neutral, and dry; then use 1mol / L FeCl 3 The solution is infiltrated so that its cation exchange capacity (CEC) is completely covered by Fe 3+ Saturation; after washing with deionized water to remove excess ions in the non-electrostatic adsorption state on the particle surface, use NaBH 4 The reducing agent converts Fe 3+ Reducted to zero-valent iron, the nanometer iron-loaded clay mineral was prepared, named as the loaded clay mineral-1.

preparation example 2-5

[0076] Preparation Example 2-5: Preparation of Supported Clay Minerals

[0077] Except using kaolin, illite, montmorillonite or attapulgite instead of sepiolite, preparation examples 2-5 were carried out in the same manner as preparation example 1, and kaolin, illite, montmorillonite loaded with nano-iron were obtained. Clay minerals of soil or attapulgite, and named as loaded clay mineral-2, loaded clay mineral-3, loaded clay mineral-4 and loaded clay mineral-5.

Embodiment 1

[0079] Stabilization treatment of heavy metal polluted soil

[0080] In a small electroplating factory in Shanghai, the heavy metals in the soil of the site were mainly chromium, nickel, and lead, with the highest concentrations of 841mg / kg, 2279mg / kg, and 632mg / kg, respectively. After testing to determine the scope and depth of pollution, use an excavator to dig out the contaminated soil and temporarily store it on the land next to the site with anti-seepage materials. Use a screening crusher to screen and crush the soil to remove large solids. Spray an aqueous solution of ferrous sulfate with a mass concentration of 10%, and the aqueous solution spraying mass is 10% of the soil mass, and stir evenly.

[0081]In parts by mass, 20 parts of sepiolite, 10 parts of loaded clay mineral-1, 10 parts of zeolite, 5 parts of yellow-green apatite, 3 parts of goethite, 5 parts of calcium silicate, 1 part of pumice, 2 parts of sulfuric acid Calcium is mixed and ground, and the mixed mate...

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Abstract

The invention relates to a reductive degradable stabilizer for heavy metal and / or organic matter polluted soil as well as a preparation method and use of the stabilizer. The reductive degradable stabilizer can be used for quickly and efficiently stabilizing the heavy metals and the organic matters in the polluted soil by virtue of a synergistic effect of a plurality of active ingredients, and can also be used for further lowering the content of the organic matters, so that the purpose of lowering leaching toxicity of pollutants and health risk is realized; therefore, the reductive degradable stabilizer is a novel and efficient stabilizer which has the advantages of being wide in treatment substrate, capable of reducing the total amount of the organic matters, good in stabilizing effect, convenient to operate and the like, and has a wide range of application in the governance fields including polluted soil, bottom mud, sludge and the like.

Description

technical field [0001] The present invention relates to a stabilizer for polluted soil, bottom mud and sludge and its preparation method and use method, in particular to a reductive and degradable stabilizer for contaminated soil, bottom mud and sludge and its preparation method and use method, belonging to the environment Governance and conservation domains. Background technique [0002] During the long-term mining, smelting and industrialization process in my country, serious heavy metal and organic pollutants have accumulated. With the acceleration of industrial restructuring and the rapid advancement of urbanization, a large number of contaminated sites left after the relocation of industrial enterprises have been exposed. The environment and human health pose a serious threat, and treatment and restoration are urgently needed before the land can be reused. [0003] On the other hand, heavy metals and organic matter in polluted rivers and lakes eventually enter the sedim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/08B09C1/08A62D3/33A62D101/43A62D101/22A62D101/20
Inventor 付融冰
Owner 付融冰
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