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A method for remediation of mine chromium heavy metal polluted soil

A technology of contaminated soil and remediation method, which is applied in the field of remediation of chromium heavy metal contaminated soil in mines, and can solve problems such as poor remediation effect of mine soil

Active Publication Date: 2019-04-09
江苏省山水生态环境建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above method is not effective for the remediation of mine soil polluted by heavy metal chromium.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the first step, a row of pumping wells and a row of water injection wells are opened and controlled on the heavy metal-contaminated surface of mines containing 34mg / Kg of chromium and zinc. The two rows of wells are parallel to each other, and the distance between the two rows of wells is 5m. The distance between the pumping wells is 9m, and the distance between adjacent water injection wells is 10m; the depth of the pumping wells and the water injection wells is 7m; a filter bag with polymer adsorbent particles for adsorbing chromium is placed inside the pumping wells;

[0027] The second step is to pressurize and send clean water into the water injection well, and at the same time carry out negative pressure suction from the pumping well head through the pumping device;

[0028] Step 3. After the suction is completed, take out the filter bag, wash off the surface sediment with water, and then perform the desorption operation. The desorption liquid used in the desorp...

Embodiment 2

[0035] In the first step, a row of pumping wells and a row of water injection wells are opened and controlled on the heavy metal-contaminated surface of mines containing 34mg / Kg of chromium and zinc. The two rows of wells are parallel to each other, and the distance between the two rows of wells is 5m. The distance between the pumping wells is 9m, and the distance between adjacent water injection wells is 10m; the depth of the pumping wells and the water injection wells is 7m; a filter bag with polymer adsorbent particles for adsorbing chromium is placed inside the pumping wells;

[0036] The second step is to pressurize and send clean water into the water injection well, and at the same time carry out negative pressure suction from the pumping well head through the pumping device;

[0037] Step 3. After the suction is completed, take out the filter bag, wash off the surface sediment with water, and then perform the desorption operation. The desorption liquid used in the desorp...

Embodiment 3

[0044] In the first step, a row of pumping wells and a row of water injection wells are opened and controlled on the heavy metal-contaminated surface of mines containing 34mg / Kg of chromium and zinc. The two rows of wells are parallel to each other, and the distance between the two rows of wells is 5m. The distance between the pumping wells is 9m, and the distance between adjacent water injection wells is 10m; the depth of the pumping wells and the water injection wells is 7m; a filter bag with polymer adsorbent particles for adsorbing chromium is placed inside the pumping wells;

[0045] The second step is to pressurize and send clean water into the water injection well, and at the same time carry out negative pressure suction from the pumping well head through the pumping device;

[0046] Step 3. After the suction is completed, take out the filter bag, wash off the surface sediment with water, and then perform the desorption operation. The desorption liquid used in the desorp...

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Abstract

The invention relates to a method for repairing mine chrome heavy metal pollution soil, and belongs to the technical field of mine environment repair. The method comprises the following steps of: a first step of digging out at least one water injection well and at least one pumping well on the surface of mine soil, and placing a filter bag filled with high-polymer adsorbent particles for adsorbing chrome inside the pumping well; a second step of pressurizing to feed clear water into the water injection well, and simultaneously carrying out negative pressure suction from a head of the pumping well by a pumping plant; a third step of taking out the filter bag after completing suction, washing out surface sediments with water, then carrying out the desorption operation, and feeding desorption solution into a reverse osmosis membrane to carry out concentration processing; a fourth step of placing the filter bag subjected to desorption into the pumping well again, and repeating the operations in the first to third steps until concentration of chrome in the soil is reduced to below regulated concentration. The method for repairing a mine site, which is provided by the invention, has an excellent repair effect on the site suffering from heavy metal chrome pollution.

Description

technical field [0001] The invention relates to a method for repairing soil polluted by chromium and heavy metals in mines, and belongs to the technical field of mine environment restoration. Background technique [0002] Metal mines are not only places where resources are concentrated, but also natural sources of soil and water ecological environment pollution. The heavy metals Pb, Hg, As, Cd, Cr, etc. lost in the mining process are important toxic elements of the soil and water ecological environment. With the increase of mining years, heavy metals in the soil environment around the mine continue to accumulate, and the pollution phenomenon is becoming more and more serious. After heavy metals enter the soil environment, their diffusion and migration are relatively slow, and they are not degraded by microorganisms. After dissolution, precipitation, coagulation, complexation, adsorption and other processes, they are easy to form different chemical forms. When it accumulate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B01J20/24B01J20/30
CPCB01J20/22B01J20/24B09C1/002
Inventor 李康
Owner 江苏省山水生态环境建设工程有限公司