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Restoration method of polluted soil

A technology of polluted soil and repair method, applied in the restoration of polluted soil, etc., can solve the problem of nutrient loss and other problems, and achieve the effect of accelerating self-repair, no secondary pollution, and increasing soil fertility

Active Publication Date: 2016-05-25
柳州市龙江水电建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for remediating contaminated soil, which solves the problem of soil leaching and leachate by in-situ leaching of heavy metals in the soil and absorbing and enriching the heavy metals in the leachate with aquatic plants. Post-processing issues and the loss of soil nutrients such as nitrogen, phosphorus, and potassium after soil leaching

Method used

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Examples

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Effect test

Embodiment 1

[0022] The invention is carried out on the soil with small area and serious heavy metal pollution. Measures are first taken to extract in situ with the extraction agent, and then the wetland plants are planted to repair the heavy metal in the soil. The implementation steps of the invention are as follows: Step 1: first place an anti-seepage film on the ground around the polluted soil, then dig out the polluted soil according to the depth of heavy metal pollution and the purpose of the repaired soil, and stack the excavated soil on the anti-seepage film. Prevent contamination of surrounding soil. Step 2: Spread thermoplastic starch plastic film around and at the bottom of the pit formed after digging out the soil, then refill the excavated soil into the pit, and build a 0.5m high fence around the top of the pit, A biodegradable plastic film is extended to the top of the wall for impermeability. The third step: choose citric acid extractant and water to form a solution with a p...

Embodiment 2

[0025] The invention is carried out on the soil with small area and serious heavy metal pollution. Measures are first taken to extract in situ with the extraction agent, and then the wetland plants are planted to repair the heavy metal in the soil. The implementation steps of the invention are as follows: Step 1: first place an anti-seepage film on the ground around the polluted soil, then dig out the polluted soil according to the depth of heavy metal pollution and the purpose of the repaired soil, and stack the excavated soil on the anti-seepage film. Prevent contamination of surrounding soil. Step 2: Spread thermoplastic starch plastic film around and at the bottom of the pit formed after digging out the soil, then refill the excavated soil into the pit, and build a 0.5m high fence around the top of the pit, A biodegradable plastic film is extended to the top of the wall for impermeability. Step 3: Use malic acid, acetic acid, tartaric acid, hydrochloric acid extractant an...

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Abstract

The invention relates to a restoration method of polluted soil. The restoration method comprises the following steps: adding an extracting solution into the polluted soil to extract heavy metals in the polluted soil, planting wetland plants in the polluted soil, and obtaining the plants with enrichment of the heavy metals after one growing season. The restoration method has the advantages that the heavy metals in the soil are extracted in situ, and aquatic plants are used for absorbing the heavy metals enriched in the extracting solution, so that the aftertreatment problem of the leached liquid from soil extraction and the problem of loss of nutrient components such as nitrogen, phosphorus and potassium and the like in the soil after soil extraction are solved; and an innovative idea and an innovative path are provided for restoring the soil polluted by the heavy metals.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to a restoration method for polluted soil, which is especially suitable for soil with moderate to heavy pollution in a small area of ​​heavy metals. Background technique [0002] The situation of soil heavy metal pollution in my country is severe, showing the characteristics of serious heavy metal pollution in cultivated land, intensified pollution in and around industrial and mining areas, and excessive heavy metals in soil in areas with high background values. There are many ways to cause soil heavy metal pollution, such as mining and smelting of heavy metals, sewage irrigation, application of heavy metal-containing fertilizers and pesticides, and special geochemical cycles. Heavy metals have significant characteristics such as high toxicity, long incubation period, and bioaccumulation. Once the soil is polluted by heavy metals, it is bound to seriously...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/08B09C1/105B09C2101/00
Inventor 徐大勇洪亚军操沛沛裘秀群
Owner 柳州市龙江水电建设有限公司
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