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Engineering-agronomic in-situ remediation method and device for heavy metal-contaminated soil

A technology for in-situ remediation of polluted soil, applied in the field of heavy metal-contaminated soil engineering-agronomic remediation, can solve the problems of complex process, low efficiency and high technical cost, and achieve the effect of good effect, high efficiency and enhanced remediation effect.

Active Publication Date: 2020-08-04
INST OF SOIL SCI CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Technical problem to be solved: the present invention aims at the shortcomings of current heavy metal-contaminated soil remediation technology such as high cost, low efficiency, and complicated process. The main link of "engineering elution-activity passivation" is to accelerate the activation and elution of heavy metals through chemical leaching, combined with engineering leaching to promote the reduction of the total amount of heavy metals, and to use agronomic measures to passivate the activity of residual heavy metals. While accelerating leaching to improve the recovery rate, It overcomes the problem of the secondary activation risk of heavy metals in soil caused by the leaching agent in the existing leaching technology

Method used

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  • Engineering-agronomic in-situ remediation method and device for heavy metal-contaminated soil
  • Engineering-agronomic in-situ remediation method and device for heavy metal-contaminated soil
  • Engineering-agronomic in-situ remediation method and device for heavy metal-contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Example 1: Soil Box Engineering - Agronomic Restoration of Cadmium and Lead Composite Polluted Ash Fluvo-aquic Soil

[0038] A suction device for seepage liquid, comprising a vertical seepage collection pipe 1, a liquid suction pipe 2, a PVC discharge pipe 3, a horizontal underground underground pipe 4, a vacuum pump 5 and a liquid collection tank 6, the vertical seepage collection pipe 1 and the horizontal The outer surface of the underground underground pipe 4 is provided with a sandstone filter material layer 7, the liquid suction pipe 2 is arranged in the vertical seepage collection pipe 1, the lower end of the liquid suction pipe is flush with the bottom of the vertical seepage collection pipe, and the upper end of the liquid suction pipe is flush with the bottom of the vertical seepage collection pipe. The PVC drain pipe 3 is connected, the outlet end of the PVC drain pipe 3 is connected with the inlet of the vacuum pump 5, the outlet of the vacuum pump 5 is connec...

Embodiment 2

[0045] Example 2: Field engineering-agronomic in-situ restoration of cadmium-lead composite polluted ash fluvo-aquic soil

[0046] A suction device for seepage liquid, comprising a vertical seepage collection pipe 1, a liquid suction pipe 2, a PVC discharge pipe 3, a horizontal underground underground pipe 4, a vacuum pump 5 and a liquid collection tank 6, the vertical seepage collection pipe 1 and the horizontal The outer surface of the underground underground pipe 4 is provided with a sandstone filter material layer 7, the liquid suction pipe 2 is arranged in the vertical seepage collection pipe 1, the lower end of the liquid suction pipe is flush with the bottom of the vertical seepage collection pipe, and the upper end of the liquid suction pipe is flush with the bottom of the vertical seepage collection pipe. The PVC drain pipe 3 is connected, the outlet end of the PVC drain pipe 3 is connected with the inlet of the vacuum pump 5, the outlet of the vacuum pump 5 is connect...

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Abstract

The invention discloses an engineering agriculture in-situ remediation method and device for heavy metal contaminated soil. A horizontal underground concealed pipe and a vertical seepage collecting pipe are laid at the depth of the soil layer of the heavy metal polluted soil; the soil layer of the heavy metal polluted soil is subjected to powder ridge deep scarifying, loose soil is loosened, and the sticky plate layer is broken; the Na2-EDTA and a compound solution of citric acid is adopted is used for leaching, and a suction device is used for collecting the heavy metal leaching liquid in thevertical water collecting pipe, the heavy metal leakage liquid flowing out of the horizontal underground concealed pipe is collected; (NH4)2SO4 re-leaching the soil and sucking and collecting the leakage liquid is used; the corn cob powder is applied, and the corn cob powder and the soil of the heavy metal polluted soil layer are uniformly mixed through a powder ridge machine, filling water for soaking, and heavy metal polluted soil remediation is finished after the infiltration is complete.

Description

technical field [0001] The invention relates to the field of heavy metal-contaminated soil engineering-agronomic restoration, in particular to an engineering-agronomic in-situ restoration method and device for heavy metal-contaminated soil. Background technique [0002] my country's latest "National Soil Pollution Survey Bulletin" released in 2014 shows that the rate of pollutant points in cultivated land across the country exceeds the standard by nearly 1 / 5, and inorganic pollutants represented by heavy metals (cadmium, mercury, arsenic, copper, lead, Chromium, zinc, nickel) over-standard points accounted for 82.8% of all over-standard points, occupying the main position. Heavy metal pollution in farmland soil has become one of the important factors threatening my country's food security and sustainable agricultural development. [0003] Compared with site soil pollution, farmland heavy metal soil pollution has its own unique characteristics. First of all, heavy metals in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08B09C2101/00
Inventor 姚荣江杨劲松谢文萍郑复乐张新王相平
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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