Stabilizer suitable for heavy metal contaminated soil and application method thereof

Abstract

A stabilizer suitable for heavy metal contaminated soil and an application method thereof belong to the technical field of contaminated soil remediation treatment. The invention is characterized in that: the soil stabilizer comprises the following components by mass: 5%-8% of heavy metal chelants, 10%-20% of gelled materials, 50%-65% of clay mineral, 10%-15% of alkaline excitants; the gelled material, clay mineral and alkaline excitant are mixed and grinded to obtain a Blaine specific surface area of 5000-8000 cm2 / g; the mixture is sieved by a 200-mesh sieve, and the water content is less than 3%; the heavy metal chelant is prepared into a solution by water with a mass percent of the chelant being 20%-40%. The stabilizer and soil are uniformly mixed, and conserved for above 5 days. The main components of the stabilizer are mostly natural materials; after the stabilizer is used, heavy metal contaminants in soil can be rapidly and effectively stabilized, and the toxicity of the contaminants is reduced. The materials used are economical and easily available, and do not cause secondary contamination, and the stabilizer is a rapid and high-efficient stabilizer for heavy metal contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of remediation and treatment of polluted soil, and in particular relates to a stabilizer for remediation and treatment of heavy metal polluted soil. Background technique [0002] With the acceleration of urbanization in my country, a large number of polluted sites are left after the relocation of urban industrial enterprises, among which heavy metal polluted soil is a common type of industrial polluted sites. Most of these polluted sites face changes in land use types due to commercial development. Before the contaminated soil is reused, remediation should be carried out to ensure the site environment and the health of residents. [0003] Stabilization technology is a relatively mature and cost-effective technology for the remediation and treatment of heavy metal-contaminated soil. This technology utilizes physical and chemical effects such as hydration reaction, oxidation-reduction, chelation, precipitatio...

AI Technical Summary

Problems solved by technology

Restoration agents containing cement components will harden and expand the soil after restoration after being added to the soil, and the fixation effect of heavy metals in the soil is easily affected by the external environment simply by the adsorption of C-S-H formed after the hydration reaction and clay minerals. Influenced by conditions, the soil has undergone long-term weathering and acid rain erosion, and the heavy metals in it have the potential danger of being redissolved

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