Stabilizing agent applicable to soil with combined pollution of heavy metals and semi-volatile organic compounds and use method thereof

Abstract

The invention discloses a stabilizing agent applicable to soil with combined pollution of heavy metals and semi-volatile organic compounds and a use method thereof. The stabilizing agent comprises the following components in percentage by weight: 5-10% of heavy-metal chelating agent, 10-20% of cementing material, 55-65% of modified clay mineral and 10-15% of alkaline exciting agent, wherein the modified clay mineral is prepared by mixing hexadecyl trimethyl ammonium bromide and sodium lauryl sulfate according to the volume ratio of (1:0.8)-(1:1.2), and then adding the hexadecyl trimethyl ammonium bromide and the sodium lauryl sulfate into the clay mineral. The use method comprises the following steps of: mixing and grinding the cementing material, the modified clay mineral and the alkaline exciting agent till the obtained particles have the Brinell specific area of 5000-8000cm<2> / g, pass through 200 meshes and have the water content less than 3%, and directly adding the obtained mixture into the soil polluted by the heavy metals according to the mass ratio of 10-20%, mixing and stirring; preparing the heavy-metal chelating agent into 10-20% solution, spraying the solution into the soil polluted by the heavy metals, mixing and stirring. The stabilizing agent and the use method disclosed by the invention have the advantages that the traditional cement type components are not used, the leaching toxicity of the treated pollutants is obviously reduced, and the heavy metals and semi-volatile organic pollutants in the soil can be fast stabilized.

Description

technical field [0001] The invention belongs to the technical field of remediation and treatment of polluted soil, and relates to a stabilizer suitable for rapid remediation and treatment of compound polluted soil with heavy metals and semi-volatile organic compounds and a use method thereof. Background technique [0002] In recent years, the pollution of the soil environment caused by my country's industrial enterprises has gradually emerged. The pollutants mainly include heavy metals, volatile and semi-volatile organic compounds. How to effectively implement the remediation of contaminated soil and ensure the health and safety of the people has become a hot spot of concern to the whole society. [0003] Stabilization technology is a relatively mature and cost-effective technology, which has a good effect in reducing the environmental risks of heavy metals and some semi-volatile organic compounds. This technology utilizes physical and chemical effects such as chelation, pr...

AI Technical Summary

Problems solved by technology

[0005] At present, there are relatively few domestic patents on stabilizers for complex polluted soils, and they mainly focus on patents using inorganic binders such as cement and lime.

Restoration agents containing cement components will harden and increase the volume of the repaired soil after being added to the soil, and the simple use of cement or lime and other inorganic binders, relying on the adsorption of C-S-H formed by hydration reactions and clay minerals, not only cannot Fully and effectively fix organic matter, and at the same time, the fixation effect of heavy metals in soil is easily affected by external environmental conditions

Organic matter interferes with the cementation process of inorganic binders, and how to select appropriate additives to achieve rapid and effective treatment of compound polluted soils has become a bottleneck in the application of this technology

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