Soil remediation agent, preparation method and application in reduction of arsenic pollution

A restoration agent and red mud technology, which is applied in the field of soil restoration agent and preparation, can solve the problems of poor sustainability, high consumption, and fluctuations in the acid-base environment of the restoration agent, and achieve a reduction in the hydrodynamic dispersion coefficient, strong acid-base buffering capacity, The effect of reducing ecotoxicity

Active Publication Date: 2021-10-29
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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  • Soil remediation agent, preparation method and application in reduction of arsenic pollution
  • Soil remediation agent, preparation method and application in reduction of arsenic pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The restoration 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) Dissolve I in waste acid from titanium dioxide production (solid-to-liquid ratio: 1:1) to obtain slurry mixture II, and then mix uniformly dry mixture II and phosphogypsum at a mass ratio of 3:1.

[0030] Red mud is the aluminum-containing waste slag produced by the Bayer process of 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] Iron oxide content in ferric fulvic acid is 5%.

[0032] Iron oxide content in sodium iron EDTA is 14.7%.

[0033] The slurry mixture II was dissolved with microwave assistance, and then left to stand at room temperature for 18 hours.

[0034] The drying step of the slurry mixture two is: place the slurry mixture two on a fluidized bed, and blow...

Embodiment 2

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

Embodiment 3

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

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Abstract

The invention discloses a soil remediation agent, a preparation method and an application in reduction of arsenic pollution. The preparation method comprises the following steps of: drying a mixed slurry obtained by activating red mud, fulvic acidchelated iron and sodium iron ethylenediamine tetraacetic acid with titanium dioxide production waste acid; and mixing a dried product with phosphogypsum to obtain the soil remediation agent. The remediation agent can reduce the ecological toxicity and leaching toxicity of arsenic at the same time, can also reduce the hydrodynamic dispersion coefficient of remedied soil, and reduces the harm of the remedied soil to 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 by 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 the soil to enter the human body. Therefore, it is necessary to reduce the leaching toxicity of arsenic-contaminated soils, thereby reducing the ecological hazards of arsenic-contaminated soils. At the same time, the hydrodynamic diffusion coefficient of arsenic-contaminated soil is one of the key p...

Claims

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Application Information

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Patent Type & Authority Applications(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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