Stabilizer suitable for heavy metal contaminated soil and application method thereof

A technology of polluted soil and heavy metal chelating agent, which is applied in the field of polluted soil remediation and treatment, can solve the problems of increasing capacity, being easily affected by external environmental conditions, and re-dissolving heavy metals, so as to reduce toxicity and biological effectiveness, and weaken ecological risks. Effect

Active Publication Date: 2012-02-08
SHANGHAI BAOFA ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Stabilizer suitable for heavy metal contaminated soil and application method thereof

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Comparison scheme
Effect test

Embodiment 1

[0019] Implementation example 1: Application of "a stabilizer suitable for heavy metal-contaminated soil" in repairing heavy metal-contaminated soil in a light bulb factory

[0020] The site is located in Nanxiang Town, Shanghai, with an area of ​​about 60,000 square meters. According to the monitoring data in the site, the excessive pollutant in the soil of the site is the heavy metal arsenic, the maximum detected content is 122mg / kg, and the contaminated area is about 3200 square meters.

[0021] Use professional excavators to excavate the soil, the excavation volume is 4300m 3 , Divide the operation unit, store the soil temporarily in the field, and set up an anti-seepage layer in the soil pile area, use the ring hammer crusher to screen the soil and evenly distribute it on the anti-seepage layer, and adjust the soil moisture content to about 20%.

[0022] Apply the soil stabilizer described in the present invention at a ratio of 12.5%. Stir and fully mix the stabilizer wi...

Embodiment 2

[0026] Implementation example 2: Application of "a stabilizer suitable for heavy metal-contaminated soil" in repairing heavy metal-contaminated soil in a chemical fertilizer plant

[0027] A chemical fertilizer factory is located in Jiading District, Shanghai, covering an area of ​​about 90 mu. The previous monitoring data in the site showed that the pollutants exceeding the standard in the soil were mainly heavy metal mercury, which needed to be repaired.

[0028] Use professional excavators to excavate the polluted soil, and the excavated earth volume is about 909m 3 , the excavation depth is 1.5m, and the operation unit is divided, the line is set out, temporarily piled up in the site, an anti-seepage layer is set up in the soil pile area, and the soil is crushed and screened by a ring hammer crusher, evenly distributed on the anti-seepage layer, and Adjust the soil moisture content to about 20%.

[0029] Apply the soil stabilizer described in the present invention, the a...

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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...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 罗启仕杨洁张长波王旌高洁
Owner SHANGHAI BAOFA ENVIRONMENTAL TECH CO LTD
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