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Remediation method of arsenic (As)-contaminated soil

A treatment method and arsenic pollution technology, applied in the field of arsenic-contaminated soil treatment, can solve the problems of high economic cost and difficulty in large-scale application, etc.

Inactive Publication Date: 2011-11-09
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional in-situ repair method has a good treatment effect, it is difficult to apply it on a large scale due to reasons such as high economic costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0010] Carry out following 4 experiments in the example 1, are respectively: (1) arsenic-contaminated soil; (2) arsenic-contaminated soil+10% red mud; (3) arsenic-contaminated soil+10% ferrous chloride modified red mud; ( 4) Arsenic-contaminated soil + 10% ferric chloride modified red mud. Add 70% of the maximum water holding capacity of the arsenic-contaminated soil to the samples, and stir evenly. The arsenic-contaminated soil is completely mixed with water and 10% red mud (or iron salt modified red mud). The mixture is allowed to stand at room temperature and cultivated for three days. , according to the US Environmental Protection Agency Toxic Leaching Procedure (EPA method 1311, the toxicity characteristic Leaching Procedure (TCLP)) to detect the release of heavy metals in the remediation of arsenic-contaminated soil, the test results are shown in Table 1.

[0011] Table 1 Leaching test results (mg / L)

[0012] sample

[0013] It can be seen from Table 1 that th...

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Abstract

The invention provides a remediation method of arsenic (As)-contaminated soil, and belongs to a treatment method of As-contaminated soil. The remediation method is technically characterized by comprising the following steps: taking low-cost red mud as a raw material to prepare an activated red mud stabilizer by a ferric salt and ferrous salt activation method; and adding the activated red mud stabilizer to the As-contaminated soil according to a certain proportion, evenly mixing, maintaining a certain water content, and culturing for a certain time so as to finally achieve the purpose of remediation of the As-contaminated soil. The remediation method has the advantages of low investment and maintenance cost, small engineering amount, simple operation management procedure, high treatment efficiency and capability of effectively solving the pollution problem of the existing As-contaminated soil, thus providing an effective solution to the As-contaminated soil treatment problem and having very important realistic significance.

Description

(1) Technical field [0001] The invention belongs to the field of soil heavy metal pollution control. Especially related to arsenic-contaminated soil treatment technology. (2) Background technology [0002] Arsenic pollution is a common environmental problem at home and abroad. Arsenic mainly comes from mining, smelting and burning of high-arsenic coal. These arsenic migrates into the environment, causing the problem of arsenic pollution and causing great harm to the environment. Prolonged exposure to inorganic arsenic can produce carcinogenic, teratogenic and mutagenic effects. [0003] At present, the remediation of arsenic-contaminated soil mainly includes physical, chemical and biological methods. These methods have their own advantages and disadvantages, but they all have problems such as high cost, large amount of engineering, and easy to cause secondary pollution. In situ remediation is a reliable remediation method. In situ chemical fixation is to add exogenous a...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 栾兆坤梁震彭先佳贾智萍
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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