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A kind of soil remediation agent and its preparation method and its application in reducing arsenic pollution

A restoration agent and arsenic-contaminated technology, which is applied in the fields of environmental engineering, geotechnical engineering and hydrogeological engineering, can solve the problems of poor sustainability of restoration agents, high consumption, poor restoration effect of arsenic-contaminated soil, etc., and reduce the hydrodynamic dispersion coefficient , Strong acid-base buffering ability, superior repairing effect

Active Publication Date: 2022-06-17
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although ferric sulfate, ferric chloride, polyferric sulfate and other materials commonly used at present can oxidize trivalent arsenic to pentavalent arsenic and reduce the leaching concentration of arsenic, they also have the following disadvantages: (1) limited to low arsenic concentration low agricultural land, and the remediation effect of high-concentration arsenic-contaminated soil in industrially polluted sites is poor; The filling effect of contaminated soil is not obvious, so the long-term effect of remediation soil or remediation site reuse is poor; (3) there are significant acid-base environment fluctuations in remediation soil or site safe reuse environment, while iron sulfate, chlorine The acid buffering capacity of materials such as iron oxide and polymeric ferric sulfate to remediate arsenic-contaminated soil is not good, which increases the environmental risk of remediating soil; (4) The production of materials such as ferric sulfate, ferric chloride, and polymeric ferric sulfate needs to consume a large amount of non-renewable minerals , the sustainability of the restorative is poor
[0004] To sum up, the traditional cement-based and iron-containing restoration agents have many defects. It is an environmental science and technology task to find new restoration agents that can be applied to high-concentration arsenic-contaminated soils, and at the same time have low restoration cost, stable performance, wide source of materials, and environmental friendliness. focus of attention

Method used

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  • A kind of soil remediation agent and its preparation method and its application in reducing arsenic pollution
  • A kind of soil remediation agent and its preparation method and its application in reducing arsenic pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The repairing agent is a homogeneous powder mixture composed of red mud (50% by mass), iron fulvic acid (40% by mass), and sodium iron EDTA (10% by mass). One is dissolved in waste acid produced by titanium dioxide (solid-to-liquid ratio is 1:1) to obtain slurry mixture II, and then the drying mixture II is mixed with phosphogypsum in a mass ratio of 3:1 to obtain.

[0030] Red mud is aluminum-containing waste slag produced by the Bayer process for producing alumina, and is processed by the following method: red mud powder with a particle size of less than 75 μm is dried at 105-125 ° C until the moisture content is lower than 2.3%.

[0031] The content of iron oxide in iron fulvic acid is 5%.

[0032] The content of iron oxide in sodium iron ethylenediaminetetraacetic acid is 14.7%.

[0033] The slurry mixture was dissolved with the aid of microwave, and then stood at room temperature for 18 hours.

[0034] The second drying step of the slurry mixture is: placing the ...

Embodiment 2

[0037] The preparation process and maintenance process of the remediation soil sample in Example 1 are the same, except that the dosage of the remediation agent is 2% (accounting for the dry weight of the contaminated soil).

Embodiment 3

[0039] The preparation process and maintenance process of the repaired soil sample in Example 1 are the same, except that the dosage of the repairing agent is 4% (accounting for the dry weight of the contaminated soil).

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Abstract

The invention discloses a soil remediation agent, its preparation method and its application in reducing arsenic pollution. The preparation method comprises activating red mud, iron fulvic acid and sodium iron ethylenediamine tetraacetic acid through titanium dioxide production waste acid. After the mixed slurry is dried, it is mixed with phosphogypsum. The remediation agent can simultaneously reduce the ecotoxicity and leaching toxicity of arsenic, and can also reduce the hydrodynamic diffusion coefficient of the remediation soil, and reduce the harm of the remediation soil to the surrounding soil and water environment.

Description

technical field [0001] The invention relates to the fields of environmental engineering, geotechnical engineering and hydrogeological engineering, in particular to a soil remediation agent, a preparation method and an application in reducing arsenic pollution. Background technique [0002] Arsenic is a highly toxic metal that poses a high risk to the ecological environment. According to the National Soil Environmental Quality Survey released in 2014, 2.7% of soil samples were contaminated with arsenic. Arsenic is highly mobile in soil and can easily spread to the surrounding environment through groundwater. Drinking arsenic-contaminated groundwater is the main way for arsenic in soil to enter the human body. Therefore, it is necessary to reduce the leaching toxicity of arsenic-contaminated soil, thereby reducing the ecological harm of arsenic-contaminated soil. At the same time, the hydrodynamic dispersion coefficient of arsenic-contaminated soil is one of the key paramet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08
CPCC09K17/40B09C1/08
Inventor 王水冯亚松辜建强傅博文潘月蒋林惠王海鑫
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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