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, and difficulty in securing treatment sites, and achieve the effect of wide application and long-term stable harmless effect.

Active Publication Date: 2007-12-05
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 using agents, for example, sodium sulfide (Na2S) is known for insolubilization, but there is a lack of long-term stability due to redissolution due to conditions such as pH
[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 treatments shown in the treatment numbers 1 to 7 in Table 1 were performed on the contaminated soil (original soil) shown in the treatment numbers 1 to 7 in Table 2, and the results shown in the 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 before the improvement treatment, and the additive amounts are as shown in Table 1.

[0053] As the improved materials, the additives shown in the table were used. For example, in the case of treatment number 1, zeolite C and zeolite M are added, then bitter earth slaked lime I is added, and finally volcanic weathered clay is added. The amount added 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 eluted amount of the contaminated soil in Table 2 was performed in the following mann...

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PUM

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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 invention relates to a method for improving polluted soil. Specifically, the method for improving polluted soil is to use metal ions harmful to the environment as new mineral phases, bury them in the soil, and improve the polluted soil after stabilization treatment. Background technique [0002] Geological pollution (stratum, waste layer, remaining earthwork, soil pollution) caused by harmful heavy metals represented by hexavalent chromium and harmful elements such as arsenic frequently occurs in the mining industry zone and its surrounding areas. [0003] In particular, in cities such as housing estates and commercial sites, the harmful heavy metals and arsenic contained in the soil are leached out with the seepage of rainwater falling into the soil, thereby polluting groundwater, rivers, etc., and causing damage to the surrounding areas. The health of residents has been endangered and serious environmental problems have arisen. [0004] Original...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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