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Method for improving heavy metal contaminated soil by adopting combination of red mud and liquid film

A technology for the improvement of contaminated soil and liquid mulch film is applied to the field of heavy metal contaminated soil improvement by the combined use of red mud and liquid mulch film, which can solve problems such as land occupation, waste of resources, groundwater pollution, etc., and achieve a significant reduction in the concentration of chromium ions and an increase in operating area. Effect

Inactive Publication Date: 2013-03-20
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

It not only occupies land, pollutes the environment, but also causes groundwater pollution and waste of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix red mud with liquid mulch and apply it to heavy metal-contaminated soil. The mass ratio of red mud to liquid mulch is 5% and 10%, which is used to remediate heavy metal-contaminated soil; at the same time, keep the water content of the soil at 5%, the pH of the soil was kept at 6.9.

[0024] The combined addition of red mud and liquid plastic film had an obvious beneficial effect on reducing the content of chromium ions in the soil. In the potted crop of Chinese cabbage, the concentration of heavy metals is 100 mg / kg, and the ratios of red mud and liquid plastic film are 5% and 10%, respectively. Adding a ratio of 5% is better than adding a ratio of 10%.

Embodiment 2

[0026] Mix red mud with liquid mulch and apply it to heavy metal-contaminated soil. The mass ratio of red mud to liquid mulch is 8%, which is used to remediate heavy metal-contaminated soil; at the same time, keep the soil moisture at 5% during crop growth. The pH of the soil was maintained at 6.9.

[0027] The combined addition of red mud and liquid plastic film had an obvious beneficial effect on reducing the content of chromium ions in the soil. In the potted crop of Chinese cabbage, the concentration of heavy metals is 100 mg / kg, and the ratio of red mud to liquid plastic film is 8%, the decrease of chromium ion concentration is better than 5% and 10%.

Embodiment 3

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PUM

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Abstract

The invention relates to a method for improving heavy metal contaminated soil by adopting combination of red mud and a liquid film. The method is characterized by comprising the concrete steps of mixing the red mud with the liquid film, applying the mixture into the heavy metal contaminated soil, wherein the mass ratio of the red mud to the liquid film is 5-10% for repairing the heavy metal contaminated soil; simultaneously keeping the moisture content of the soil at 4-5% during the period of crop growth, and keeping the pH of the soil at 6.7-6.9. The concentration of chromium ions is obviously reduced after repairing by adopting the method disclosed by the invention, and the heavy metal contaminated soil is effectively processed.

Description

technical field [0001] The invention relates to the combined use of red mud and liquid plastic film to improve heavy metal-polluted soil. Specifically, solid waste red mud and liquid plastic film are used in combination according to a certain ratio to achieve the removal of heavy metal chromium in soil. Background technique [0002] With the acceleration of urbanization, the physical and chemical properties of the soil have deteriorated. At the same time, a large amount of solid waste generated by urbanization is mostly used for general landfill treatment, causing serious pollution to the soil. Improper mining of mineral resources has exposed a large number of abandoned mining sites, polluted farmland through water flow and other channels, and also caused the heavy metal content in the soil to seriously exceed the standard. Red mud is a kind of solid waste generated during the production process of alumina plant. It not only occupies land, pollutes the environment, but als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 王新梁吉艳崔丽
Owner SHENYANG POLYTECHNIC UNIV
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