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Composite stabilizer for repairing lead, cadmium and arsenic pollution in acid soil

A composite stabilizer and acidic soil technology, applied in the direction of soil conditioning materials, applications, fertilizer mixtures, etc., can solve the problems of heavy metals, repair effect, large usage, etc., to prevent heavy metals from re-dissolving, preventing secondary pollution, pharmaceuticals The effect of adding a small amount

Active Publication Date: 2017-07-25
HUNAN XISI ECOLOGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that heavy metal soil remediation agents in the prior art have a large amount of use, heavy metal back-dissolution phenomenon, and can not repair the compound polluted site of lead, cadmium and arsenic at the same time or the effect of simultaneous repair is poor; The purpose is to provide a heavy metal soil remediation agent that can immobilize and stabilize arsenic, lead and cadmium at the same time, and the dosage is small, does not affect the soil structure, has a good effect on soil remediation, and can prevent heavy metals from resolubilizing

Method used

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  • Composite stabilizer for repairing lead, cadmium and arsenic pollution in acid soil
  • Composite stabilizer for repairing lead, cadmium and arsenic pollution in acid soil
  • Composite stabilizer for repairing lead, cadmium and arsenic pollution in acid soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Composite stabilizer is configured according to the following ratio:

[0023]

[0024] Add the prepared agent according to 5% of the quality of the polluted soil, add water and stir, keep the moisture content at about 30%, and keep it for 7 days naturally. After leaching in the "Solid Waste Leaching Toxicity Method Horizontal Oscillation Method", use ICP-MS to analyze the Pb , Cd, As concentrations (μg / L) are:

[0025]

[0026] The prepared agent is added at 3% of the quality of the polluted soil, mixed with water, and kept at a moisture content of about 30%, and naturally cured for 7 days. After leaching in the "Solid Waste Leaching Toxicity Method Horizontal Oscillation Method", Pb is obtained by ICP-MS analysis. , Cd, As concentrations (μg / L) are:

[0027]

[0028]

[0029] The prepared agent is added according to 3% of the quality of the polluted soil, mixed with water, and the moisture content is kept at about 30%, and it is naturally maintained for 180 ...

Embodiment 2

[0033] Composite stabilizer is configured according to the following ratio:

[0034]

[0035] The prepared agent is added at 3% of the quality of the polluted soil, mixed with water, and kept at a moisture content of about 30%, and naturally cured for 7 days. After leaching in the "Solid Waste Leaching Toxicity Method Horizontal Oscillation Method", Pb is obtained by ICP-MS analysis. , Cd, As concentrations (μg / L) are:

[0036]

Embodiment 3

[0038] Composite stabilizer is configured according to the following ratio:

[0039]

[0040] The prepared agent is added at 3% of the quality of the polluted soil, mixed with water, and kept at a moisture content of about 30%, and naturally cured for 7 days. After leaching in the "Solid Waste Leaching Toxicity Method Horizontal Oscillation Method", Pb is obtained by ICP-MS analysis. , Cd, As concentrations (μg / L) are:

[0041]

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PUM

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Abstract

The invention discloses a composite stabilizer for repairing lead, cadmium and arsenic pollution in acid soil. The composite stabilizer comprises the following components: calcium superphosphate, goethite, humic acid, quick lime, polyacrylamide and the like. The composite stabilizer is used for repairing heavy metal polluted soil, arsenic, lead and cadmium can be fixed and stabilized simultaneously, the use amount is small, a soil structure is not affected, the soil repairing effect is good, and re-dissolution of heavy metal can be prevented.

Description

technical field [0001] The invention relates to a remediation agent for heavy metal polluted soil, in particular to a remediation agent for acidic soil contaminated by metals such as lead, cadmium and arsenic, and belongs to the technical field of remediation of heavy metal polluted soil. Background technique [0002] Chemical stabilization refers to the addition of chemical agents to the soil to change the existing form of heavy metals in the soil and transform them into substances with low toxicity, low solubility and low mobility. The main technologies include redox potential technology, pH control technology, ion exchange technology, precipitation technology, adsorption technology, etc. At present, the commonly used stabilizing agents include sodium hydroxide, sodium sulfide, phosphate, silicate, ferrous sulfate, ferric chloride and polymer organic stabilizers. The current soil sites are often compound-polluted by multiple heavy metals, and a single agent cannot fully a...

Claims

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Application Information

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IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 张卫赵轶戴孙强孙梦莹侯晓丽杨广超
Owner HUNAN XISI ECOLOGY TECH
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