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Method for improving polluted soil

A technology for polluted soil and soil, applied in the restoration of polluted soil and other directions, can solve the problems of high cost, temporary isolation of polluted soil, lack of long-term stability, etc., and achieve the effect of wide application and long-term stable harmless effect.

Active Publication Date: 2005-11-02
阿斯特古东京股份有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, transporting the contaminated soil to the final disposal site and segregating it is not only difficult to secure the disposal site, but also the cost of replacing the new soil is high, and the result is only the movement or spread of the contaminated soil without solving any problems
[0006] Chemical treatment with agents such as sodium sulphide (Na 2 S) Insolubilization treatment is performed, but there is a problem of lack of long-term stability due to conditions such as pH that cause re-dissolution
[0007] Cement solidification treatment, the result is only temporary isolation of contaminated soil, and there is also a lack of long-term stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The contaminated soil (original soil) shown in treatment numbers 1 to 7 in Table 2 was subjected to the treatments shown in treatment numbers 1 to 7 in Table 1, and the results shown in treatment numbers 1 to 7 in Table 3 were obtained.

[0052] In the treatment numbers 1 to 7 in Table 1, the pretreatment means that the additives are used for treatment before the improvement treatment, and the amount of addition is shown in Table 1.

[0053] For the improved materials, use the additives shown in the table. For example, in the case of treatment number 1, add zeolite C and zeolite M, then add bitter soil slaked lime I, and finally add volcanic weathered clay. The addition amount is shown in Table 1. Zeolite C was not used in treatment number 6.

[0054] Zeolite C: Clinoptilolite (150meq / 100g)

[0055] Zeolite M: Mordenite (150meq / 100g)

[0056] The analysis of the elution amount of the contaminated soil in Table 2 was performed according to the following method.

[0057] Cadm...

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Abstract

The present invention relates to polluted soil improving method and features that the polluted soil is mixed with zeolite, bitter earth, hydrated lime and glutinous earth to form new mineral phase improving soil. One other polluted soil improving method features that arsenic ion containing polluted soil is improved through mixing with bivalent iron salt to produce ferric arsenate, adsorbing ferric arsenate with zeolite, mixing with bitter earth and hydrated lime, and mixing with glutinous earth to form new mineral phase improving soil.

Description

Technical field [0001] The present invention relates to a method for improving contaminated soil. Specifically, the method for improving contaminated soil is to use metal ions harmful to the environment as a new mineral phase, buried in the soil, and stabilized to improve the contaminated soil. Background technique [0002] Geological pollution (stratum, waste layer, remaining earthwork and soil pollution) caused by harmful heavy metals represented by hexavalent chromium and harmful elements such as arsenic has frequently occurred in the mining industry zone and its surrounding areas. [0003] In particular, in places such as homes and commercial sites in cities, harmful heavy metals and arsenic contained in the soil are eluted with infiltration water such as rainwater falling into the soil, thereby polluting groundwater and rivers, etc. The health of the residents of the country is endangered, and serious environmental problems have occurred. [0004] Originally, in order to sol...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 湊秀雄和田信彦森本辰雄
Owner 阿斯特古东京股份有限公司
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