Method for repairing heavy metal contaminated soil

A technology for polluted soil and heavy metals is applied in the field of polluted soil treatment to achieve the effect of good effect, simple and low cost, and improvement of soil quality

Active Publication Date: 2014-07-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of this technology can only remove lead, and a certain amount of secondary pollution will be caused in the chelating eluent (EDTA) eluent

Method used

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  • Method for repairing heavy metal contaminated soil
  • Method for repairing heavy metal contaminated soil
  • Method for repairing heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for repairing heavy metal contaminated soil, comprising the steps of:

[0034] (1) Break up a dry paddy field polluted by heavy metals, and break the soil at a depth of 0.5m to less than 2mm; irrigate until the water layer on the soil layer reaches a depth of 10cm; add light resin microspheres as The adsorbent is mechanically stirred for 20 minutes and left to stand for 6 hours, and the adsorbent that has completed the adsorption is taken out and the supernatant is discharged at the same time to complete the primary repair; the specific gravity of the light resin microspheres is less than 1.

[0035] (2) Put the adsorbent removed in step (1) into the reaction pool and add eluent to elute heavy metals, and the adsorbent after elution is recycled; the eluted wastewater after elution is treated for wastewater;

[0036] (3) Repeat step (1) and step (2) for the paddy fields polluted by heavy metals until the heavy metal content index of the polluted soil is qualifie...

Embodiment 2

[0052] A polluted terrace

[0053] A method for repairing heavy metal contaminated soil, comprising the steps of:

[0054] (1) Break up a dry paddy field polluted by heavy metals, and break the soil 0.55m deep into clods less than 2.5mm; irrigate until the water layer on the soil layer reaches 12.5cm deep; add light resin micro The ball is used as an adsorbent, mechanically stirred for 25 minutes, and left to stand for 7 hours, and the adsorbent that is floating on the water surface and completed the adsorption is taken out, and the supernatant is discharged at the same time to complete the primary repair; the specific gravity of the light resin microsphere is less than 1 .

[0055] (2) Put the adsorbent removed in step (1) into the reaction pool and add eluent to elute heavy metals, and the adsorbent after elution is recycled; the eluted wastewater after elution is treated for wastewater;

[0056] (3) Repeat step (1) and step (2) for the paddy fields polluted by heavy metal...

Embodiment 3

[0073] A polluted terrace

[0074] A method for repairing heavy metal contaminated soil, comprising the steps of:

[0075] (1) Break up a dry paddy field polluted by heavy metals, and break the soil at a depth of 0.6m to less than 3mm; irrigate until the water layer on the soil layer reaches a depth of 15cm; add light resin microspheres as The adsorbent is mechanically stirred for 30 minutes and left to stand for 8 hours, and the adsorbent that has completed the adsorption is taken out floating on the water surface, and the supernatant is discharged at the same time to complete the primary repair; the specific gravity of the light resin microspheres is less than 1.

[0076] (2) Put the adsorbent removed in step (1) into the reaction pool and add eluent to elute heavy metals, and the adsorbent after elution is recycled; the eluted wastewater after elution is treated for wastewater; Described wastewater treatment can adopt various existing, conventional wastewater treatment pro...

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Abstract

The invention discloses a method for repairing heavy metal contaminated soil. The method comprises the steps of breaking a heavy metal contaminated paddy field, irrigating the paddy field until a water logging layer on a soil layer is 10-15cm deep after breaking the 0.5-0.6m deep soil on the surface layer into soil lumps with sizes less than 2-3mm, adding a modified clay mineral adsorbent, mechanically stirring the adsorbent, standing for 6-8 hours, fishing out the adsorbent which floats on water and completes adsorption, and simultaneously discharging the supernatant, thus completing first-level repair; then collecting adsorbed light ceramsites, eluting the ceramsites in a wastewater treatment plant, and then repeating the previous steps until the soil reaches the standard. The method is simple to operate, is low in cost, has high removal efficiency, meets actual requirements and has good popularization and application values.

Description

technical field [0001] The invention relates to the field of contaminated soil treatment, in particular to a method for repairing heavy metal polluted soil. Background technique [0002] Cadmium (Cd), mercury (Hg), and arsenic (As) are currently recognized as heavy metal elements that are harmful to the human body. They produce toxic effects on the human body by inhibiting the activity of enzymes. Due to various production activities of human beings, the degree of pollution to the ecological environment is increasing day by day, among which the pollution of soil has become a serious problem that cannot be ignored. Toxic heavy metal elements in agricultural land generally refer to five types of mercury, cadmium, arsenic, chromium, and lead. In the south, cadmium is the most toxic and harmful, and the problem of water and soil pollution in the Pearl River Delta is prominent. The soils in these areas are dominated by low-pH soils with variable charges, which have weak bufferin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 牛晓君
Owner SOUTH CHINA UNIV OF TECH
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