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Application method of bentonite in soil heavy metal pollution remediation

A technology of pollution remediation and application methods, applied in the restoration of polluted soil and other directions, can solve the problems of soil pollution, no barrier layer, and soil remediation projects that do not meet expectations.

Pending Publication Date: 2022-01-11
中地宝联(北京)国土资源勘查技术开发集团有限公司
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Problems solved by technology

[0002] Many heavy metal-contaminated soils often rebound to varying degrees after the completion of restoration, and some even return to the level of pollution before restoration, making soil restoration projects unable to achieve the expected results; existing In the technology, the soil is not equipped with a barrier layer when the heavy metal pollution is repaired. After three or four years after the repair is completed, the repaired soil will be polluted again due to the infiltration, leaching and capillary action of the soil and groundwater, and it is urgent to wait for a solution.

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  • Application method of bentonite in soil heavy metal pollution remediation

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Embodiment Construction

[0013] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by those skilled in the art to which the present invention belongs. "First", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right" and so on are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change acc...

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Abstract

The invention relates to an application method of bentonite in soil heavy metal pollution remediation. The method comprises the following steps: (1) completely stripping to-be-remediated soil, and remediating; (2) leveling the stripped subbase soil so as to lay a bentonite material; (3) according to the pollution degree of heavy metal elements, permeability parameters of a soil layer and the like, selecting the type of bentonite and designing the laying thickness, and laying to form a bentonite isolation layer; and (4) backfilling the stripped and remediated polluted soil onto the bentonite isolating layer to finish the soil remediation process. and (5) after 3-12 months, sampling and detecting the polluted soil to verify the remediation effect of the soil. According to the invention, the bentonite isolation layer is arranged between the subbase layer soil layer and the polluted soil layer so as to effectively block permeation leaching and capillary action of underground water in the soil layer, so that the remediated soil is thoroughly prevented from being polluted again by heavy metal elements, and the effect is achieved once and for all.

Description

technical field [0001] The invention relates to an application method of bentonite in repairing soil heavy metal pollution. Background technique [0002] Many heavy metal-contaminated soils often rebound to varying degrees after the completion of restoration, and some even return to the level of pollution before restoration, making soil restoration projects unable to achieve the expected results; existing In the technology, the soil is not equipped with a barrier layer when the heavy metal pollution is repaired. After three or four years after the restoration is completed, the repaired soil will be polluted again due to the leaching and capillary action of the soil and groundwater, and it is urgent to wait for a solution. Contents of the invention [0003] In view of the present situation of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a bentonite which can effectively block the infiltration and leaching and capil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/00
Inventor 董桂海李丽林观生王超峰佟德凯
Owner 中地宝联(北京)国土资源勘查技术开发集团有限公司
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