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A three-level method for repairing heavy metal-contaminated soil

A technology of polluted soil and heavy metals, applied in the field of contaminated soil treatment, can solve the problems of unsatisfactory restoration of contaminated soil, achieve the effect of reducing the number of residues and improving soil quality

Active Publication Date: 2016-03-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the problem is that the adsorbed ions in this kind of adsorption phenomenon are easier to release, which is not ideal for the restoration of contaminated soil.

Method used

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  • A three-level method for repairing heavy metal-contaminated soil
  • A three-level method for repairing heavy metal-contaminated soil
  • A three-level method for repairing heavy metal-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for three-stage remediation of heavy metal-contaminated soil, comprising the following steps:

[0028] (1) Break up a 6m×9m dry paddy field polluted by heavy metals, and break the surface 0.5m deep soil to less than 2mm soil clods; irrigate until the water layer on the soil layer reaches 10cm deep; add light pottery The granular modified clay mineral adsorbent is mechanically stirred for 20 minutes, and left to stand for 6 hours, and the adsorbent that has completed the adsorption is removed floating on the water surface, and the supernatant is discharged at the same time to complete the primary repair; the modified clay mineral adsorbs The agent is lightweight ceramsite made of a mixture of montmorillonite clay modified adsorbent, chitosan modified clay, bentonite modified clay, and phosphoric acid modified attapulgite. The pH value is 5-8, and the mixing ratio is volume The ratio is 1:2:1:1; mechanical agitation can be achieved by rakes, manual or electric. ...

Embodiment 2

[0044] Remediation of contaminated soil in a suburb of the Pearl River Delta:

[0045] A method for three-stage remediation of heavy metal-contaminated soil, comprising the following steps:

[0046] (1) Break up a 6m×9m dry paddy field polluted by heavy metals, and break the surface 0.55m deep into clods less than 2.5mm; irrigate until the water layer on the soil layer reaches 12.5cm deep; add light The modified clay mineral adsorbent in the form of ceramsite is mechanically stirred for 25 minutes and left to stand for 7 hours. The adsorbent that has completed the adsorption is taken out and the supernatant is discharged at the same time to complete the primary restoration; the modified clay The mineral adsorbent is lightweight ceramsite made of a mixture of montmorillonite clay modified adsorbent, chitosan modified clay, bentonite modified clay, and phosphoric acid modified attapulgite. The pH value is 6.5, and the mixing ratio is volume The ratio is 1:2:1:1; mechanical agit...

Embodiment 3

[0062] A polluted land experiment in the Pearl River Delta is as follows:

[0063] Remediation of contaminated soil in a suburb of the Pearl River Delta:

[0064] A method for three-stage remediation of heavy metal-contaminated soil, comprising the following steps:

[0065] (1) Break up a 6m×9m dry paddy field polluted by heavy metals, and break the surface 0.6m deep soil to less than 3mm soil clods; irrigate until the water layer on the soil layer reaches 15cm deep; add light pottery Granular modified clay mineral adsorbent, mechanically agitated for 30 minutes, and left to stand for 8 hours, remove the adsorbent that is floating on the water surface and discharge the supernatant to complete the primary repair; the modified clay mineral adsorbs The agent is lightweight ceramsite made from a mixture of montmorillonite clay modified adsorbent, chitosan modified clay, bentonite modified clay, and phosphoric acid modified attapulgite. The pH value is 8, and the mixing ratio is 1...

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Abstract

The invention discloses a method for carrying out three-level remediation on 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 remediation; then uniformly adding magnetic nano materials to the soil with adjusted moisture content, mechanically stirring the materials, standing for 3-8 hours, and collecting part of heavy metals in the soil by way of magnetic separation; preparing leachate for leaching, adding nano iron powder while leaching, and then, leaching 1-3 times by using pure water as an eluent, thus completing third-level remediation, wherein the amount of water used each time is 0.6-1 times the leachate added for the first time by volume. 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 three-stage 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 w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08B01J20/24B01J20/30
Inventor 牛晓君王彩虹
Owner SOUTH CHINA UNIV OF TECH
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