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Method for treatment of arsenic-contaminated soil

一种砷污染、土壤的技术，应用在处理砷污染土壤领域，能够解决经济不利等问题

Inactive Publication Date: 2006-06-21
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Treatment by this method is economically unfavorable due to the use of expensive chemicals

Method used

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  • Method for treatment of arsenic-contaminated soil
  • Method for treatment of arsenic-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The following four experiment numbers 1 to 4 were carried out as comparative examples. A sample of arsenic-contaminated soil (Kanto loam) containing 0.097 mg / L of leachable arsenic was obtained. The samples (100 pbw) were thoroughly mixed with water and varying amounts of slaked or quicklime as follows.

[0048] In number 1, 40pbw of water and 5pbw of slaked lime.

[0049] In number 2, 40pbw of water and 7pbw of slaked lime.

[0050] In number 3, 40pbw of water and 12pbw of slaked lime.

[0051] In No. 4, 40pbw of water and 5pbw of quicklime.

[0052] The mixture was allowed to stand at room temperature.

[0053] After aging for 1 day, 7 days and 28 days, the arsenic leaching of the mixture was measured according to the method specified in the Environmental Quality Standard for Solid Pollutants (Circular No. 46) by the Ministry of Environment Agency of Japan. The test results are shown in Table 3.

[0054] experiment

[0055] In Example 1, the following ...

Embodiment 2

[0065] The following two experiments, numbered 9 and 10, were carried out in Example 2. A sample of arsenic-contaminated soil (Kanto loam) having a leached arsenic amount of 0.109 mg / L was obtained from the same place as in the comparative example. Its arsenic content is about 4 times of the arsenic content in Example 1. The samples were heated in a furnace at 550°C for 20 minutes under an air atmosphere. The heated samples (100pbw) were thoroughly mixed with water below and varying amounts of quicklime.

[0066] In No. 9, 40pbw of water and 3pbw of quicklime.

[0067] In No. 10, 40pbw of water and 5pbw of quicklime.

[0068] The mixture was allowed to stand at room temperature.

[0069] After aging for 1 day, 7 days and 28 days, the arsenic leaching of the mixture was measured according to the method specified by the Japanese Ministry of the Environment in Circular No. 46. The test results are shown in Table 5.

[0070] Reality

[0071] Can know from table 5,...

Embodiment 3

[0073] Example 3 The following three experiments were carried out, numbered 11-13. A sample of arsenic-contaminated soil (Kanto loam) was obtained from the same place as in the comparative example, and the amount of leachable arsenic contained in the sample was about 3 to 4 times that of Example 2. The sample (100 pbw) was mixed with quicklime (3 pbw in code 11, 5 pbw in code 12, 10 pbw in code 13). The mixture was heated in a furnace at 550°C for 20 minutes under an air atmosphere. The heated mixture (100 pbw) was mixed thoroughly with water (40 pbw). The mixture was allowed to stand at room temperature. After aging for 1 day, 7 days and 28 days, the arsenic leaching of the mixture was measured according to the method specified by the Japanese Ministry of the Environment in Circular No. 46. The test results are shown in Table 6.

[0074] Reality

[0075] Can know from table 6, as shown in experiment number 11~13 among the embodiment 3, the combination of heat t...

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Abstract

Disclosed herein is a method for treating arsenic-contaminated soil, which is capable of insolubilizing arsenic compounds (organic form or tri- or pentavalent inorganic form), thereby reducing their leaching to below the soil environmental standard value . The method consists of the following steps: the arsenic-contaminated soil is heated at 200-700° C., and then the heated soil is mixed with calcium compound and water. The method can also be composed of the following steps: arsenic-contaminated soil is mixed with calcium compound, then the mixed soil is heated at 200-700° C., and the heated soil is mixed with water again.

Description

technical field [0001] The present invention relates to a method for treating arsenic-contaminated soil, the concept of which is to make arsenic insoluble in the soil, so that the amount of leached arsenic is lower than the level specified by the soil environmental standard value. Background technique [0002] Factories and businesses that handle chemicals and pesticides often contaminate the soil with heavy metals that are discarded or leaked from equipment and instruments. A traditional approach to this problem has been to remove the pollutants from the soil by heating or washing, or by adding chemicals to the soil to render the pollutants insoluble. The treatment of soil contaminated with organic arsenic compounds derived from chemical weapons includes heating the contaminated soil in a kiln or the like to decompose the pollutants. However, since arsenic compounds take various forms, such as trivalent or pentavalent inorganic or organic arsenic compounds, and the charact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06A62D3/33A62D3/38A62D101/24A62D101/43B09B3/00B09C1/02B09C1/08
CPCB09C1/06B09C1/08
Inventor 井田彻村上裕稻田裕
Owner KOBE STEEL LTD
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