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Layered replacement repair method for mercury-polluted farmland

A remediation method and technology for mercury pollution, applied in the field of contaminated soil remediation, to achieve the effects of less equipment, guaranteed safety, and easy purchase

Active Publication Date: 2021-02-26
广州草木蕃环境科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The soil replacement method and the isolation and embedding method are to transfer or isolate the contaminated soil, but these methods are only applicable to lightly polluted areas with a small scope of pollution

Method used

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  • Layered replacement repair method for mercury-polluted farmland
  • Layered replacement repair method for mercury-polluted farmland

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Layered replacement and restoration of a mercury-contaminated farmland in Puning City, Jieyang City, including:

[0067] 1. The soil to be repaired shall be tested in layers, and the soil shall be collected at depths of 0-20cm, 20-40cm, 40-60cm, 60-80cm and 80-100cm, and the mercury content in the soil shall be measured respectively. The results are shown in Table 1 below :

[0068] Table 1 Soil Hg content at different depths before remediation

[0069]

[0070] 2. Divide shallow polluted soil and deep clean soil, a 平1 = 0.466 mg / kg, The soil with a depth of 0-40 cm is shallow polluted soil, and the soil with a depth of 40-80 cm is shallow polluted soil;

[0071] 3. Divide the soil into several operation units, each with an area of ​​5m*120m, dig out the shallow contaminated soil of the operation unit and place it on one side, and dig out the deep clean soil of the operation unit and place it on the other side , backfill the shallow contaminated soil into the ...

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Abstract

The invention discloses a layered replacement repair method for mercury-polluted farmland. The method comprises the following steps: respectively shoveling out and stacking shallow-layer polluted soiland deep-layer clean soil through an excavator bucket, backfilling shallow-layer polluted soil subjected to curing treatment to a deep-layer position for tamping, and backfilling the original deep-layer clean soil on the cured shallow-layer polluted soil, thereby achieving layered replacement of the shallow-layer polluted soil and the deep-layer clean soil. The mercury content of the repaired surface soil reaches the standard, the content of mercury pollution of the shallow soil is effectively reduced, secondary pollution of the soil is avoided, and the quantity of pollutants is reduced to the maximum extent; the land utilization rate is increased, and the normal agricultural production requirement is met; and the safety of agricultural products is guaranteed, and the risk that agricultural products exceed standards to human health is avoided.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a layered replacement and remediation method for mercury-contaminated farmland. Background technique [0002] The environmental safety of farmland soil directly affects the national food supply, and is an important lifeline related to the national economy and people's livelihood. Heavy metal Hg has become one of the most common and highly harmful heavy metal pollutants in soil. Heavy metals in farmland soil can not only migrate in the environment through dissolution and sedimentation, but also amplify the accumulation of heavy metal Hg in organisms through agricultural products. Harmful to the ecological environment and human body. [0003] At present, the Hg remediation methods in farmland soil mainly include physical methods, chemical methods, microbial methods, etc., but these methods have the disadvantages of high possibility of secondary pollution and ...

Claims

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Application Information

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IPC IPC(8): B09C1/00
CPCB09C1/00
Inventor 俞龙生崔育张菀黄伟江丁晓龙常广义历军林楚裕赵泓斌李智鸣田美玲
Owner 广州草木蕃环境科技有限公司
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