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

A semi-volatile, compound pollution technology, applied in the field of contaminated soil remediation, can solve the problems of heavy metal fixation easily affected by external environmental conditions, interference, inability to fix organic matter, etc., to achieve fast, efficient and stable solidification technology, reduce toxicity and Bioavailability, the effect of reducing ecological risk

Inactive Publication Date: 2014-05-07
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 reacti

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A stabilizer suitable for heavy metal and semi-volatile organic compound polluted soil, the stabilizer contains the following components in mass ratio: heavy metal chelating agent EDTA5%, cementitious material silicate 20%, modified clay mineral 65%, Alkaline activator sodium sulfate 10%, the sum of its raw materials is 100%;

[0023] The modified clay mineral is prepared as follows: prepare a mixed solution of cetyltrimethylammonium bromide and sodium lauryl sulfate at a volume ratio of 1:0.8, and add it to the clay mineral zeolite with a mass ratio of 5%. After shaking at 50°C for 8h, filter, wash, filter again, dry at 85°C for 60h, grind, and pass through a 200-mesh sieve.

Embodiment 2

[0025] A stabilizer suitable for heavy metal and semi-volatile organic compounds compound polluted soil, the stabilizer comprises the following components in mass ratio: 10% of the 1:1 compound of heavy metal chelating agent EDTA and ferrous sulfide, gelling material silicon Aluminate 20%, modified clay mineral 55%, alkaline activator sodium sulfate 15%, the sum of its raw materials is 100%;

[0026] The modified clay mineral is prepared as follows: prepare a mixed solution of cetyltrimethylammonium bromide and sodium lauryl sulfate at a volume ratio of 1:1.2, and add it to the clay mineral leech with a mass ratio of 10%. After shaking at 40°C for 10h, filter, wash, filter again, dry at 90°C for 48h, grind, and pass through a 200-mesh sieve.

Embodiment 3

[0028] A stabilizer suitable for heavy metal and semi-volatile organic compounds compound polluted soil, the stabilizer comprises the following components in mass ratio: 8% of heavy metal chelating agent ferrous sulfide, 1% of cementitious material silicate and aluminosilicate : 1 compound 18%, modified clay mineral 62%, alkaline activator sodium sulfate 12%, and its raw material sum is 100%;

[0029] The modified clay mineral is prepared as follows: prepare a mixed solution of cetyltrimethylammonium bromide and sodium lauryl sulfate at a volume ratio of 1:1.1, and add it to the clay mineral kaolin with a mass ratio of 7%. After shaking at 45°C for 9h, filter, wash, filter again, dry at 88°C for 48h, grind, and pass through a 200-mesh sieve.

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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...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
Inventor 杨洁高洁朱江王旌张长波罗启仕
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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