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An in-situ remediation method for acidic soil containing heavy metals

An in-situ remediation, acid soil technology, applied in the restoration of polluted soil, etc., can solve problems such as difficulty in remediating soil remediation effect, insufficient water retention, unevenness, etc., to reduce bioavailability, improve fertility and ecology. Micro-environment, low-cost effect

Active Publication Date: 2016-03-23
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high alkalinity of the repairing materials, it is easy to cause the alkalinity to be too high and uneven when applied directly to the soil. More importantly, due to the fast water absorption of the material and insufficient water retention, it is difficult to achieve the ideal repairing effect of repairing the soil.

Method used

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  • An in-situ remediation method for acidic soil containing heavy metals
  • An in-situ remediation method for acidic soil containing heavy metals
  • An in-situ remediation method for acidic soil containing heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] Under the conditions of indoor simulation research, take 100g of artificially polluted soil, the pH value of the soil is 6, and the contained Cd concentrations are 0.1, 1.0, 2, 3, 4mgkg -1 , put it in a petri dish, add 2.7g conditioning matrix 1 (the preparation method of conditioning matrix 1 is described in the specific implementation section) and stir evenly, when the pH value of the soil is 7, add 2.7g conditioning matrix 2 (conditioning matrix 1 The preparation method of matrix 2 is as described in the specific implementation section), stir evenly and spray tap water, keep the moisture content of the soil above 80%, after 15, 30, 45, and 60 days of restoration, test and count the soil samples of each treatment group The exchangeable state content of Cd in . The results are shown in Table 3 (each treatment was repeated three times, and the results were averaged).

[0035] Table 3 Exchangeable content of Cd in soil after treatment

[0036]

[0037] It can be s...

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Abstract

The invention discloses an in-situ restoration method for acidic soil containing heavy metals, which comprises the following steps: 1) preparing a conditioning matrix 1; 2) preparing a conditioning matrix 2; 3) in-situ restoration. The application of the conditioning substrate of the present invention can not only regulate the acid-base environment of the soil, but also improve the soil fertility and its biological self-purification ability, effectively solve the problem of improving the acid condition of the soil and passivate the heavy metal pollutants. The conditioning matrix used in the invention is all from the waste in the production process, easy to obtain, low in cost, easy to operate and short in restoration period, effectively solves the problem of in-situ restoration, and can create good economic and social benefits.

Description

technical field [0001] The invention relates to an in-situ restoration method for acidic soil containing heavy metals. Background technique [0002] Toxic and harmful pollutants, such as heavy metals, have the characteristics of bioaccumulation and accumulation after entering the soil. Their toxic effects are often amplified on crops through the relationship of the food chain, remaining in crops, and ultimately endangering the health of humans and animals. Therefore, in the current situation that the soil in many areas of our country is seriously polluted by heavy metals, the research on the treatment and restoration technology of soil polluted by heavy metals, especially acidic soil, is urgent. [0003] The current remediation techniques for acidic soil contaminated by heavy metals can be divided into in-situ remediation and ex-situ remediation. Relatively speaking, ex situ restoration has low environmental risk and high predictability of system treatment, but it is costly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08
Inventor 曾丽璇吕向红张秋云
Owner SOUTH CHINA NORMAL UNIVERSITY
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