Treatment method for heavy metal pollution of soil

Abstract

The invention belongs to the treating direction of soil pollution, and particularly relates to a treatment method for heavy metal pollution of soil. Biodegradable citric acid is added into the polluted soil to serve as a heavy metal activating agent for activating non-free state heavy metal on the soil particle surfaces, the non-free state heavy metal is converted into free state heavy metal easyto capture and absorb, and therefore the heavy metal superaccumulative plant absorption efficiency is strengthened, the pollution repairing speed can be increased, the citric acid can be degraded andused by biology (such as saccharomycetes ), and the problem of secondary pollution does not exist.

Description

technical field [0001] The invention belongs to the direction of soil pollution control, and in particular relates to a control method for soil heavy metal pollution. Background technique [0002] Soil is the material basis for human survival. The environmental conditions of the soil affect the yield and quality of agricultural products. If the soil is polluted, the pollution source will affect human health through the food chain. Therefore, attention must be paid to the control of soil pollution. [0003] At present, soil treatment methods mainly include chemical leaching method, microbial method, animal and plant restoration method, chemical solidification method and so on. Each approach has advantages, but also has its disadvantages: [0004] (1) Although the chemical leaching method can remove the heavy metals in the polluted soil through the leaching agent, the leaching agent is likely to cause secondary pollution, and the depth of soil treatment is limited, and heavy ...

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Problems solved by technology

[0004] (1) Although the chemical leaching method can remove the heavy metals in the polluted soil through the leaching agent, the leaching agent is likely to cause secondary pollution, and the depth of soil treatment is limited, and heavy metals are likely to remain;

[0005] (2) In the microbial method, because microorganisms are prone to genetic variation, there are problems of poor system stability and difficulty in large-scale promotion;

[0006] (3) Although the animal and plant restoration method is easy to implement, its restoration efficiency is low and the restoration period is very long;

[0007] (4) The chemical solidification method uses the decomplexation and chelation of the adsorbent to decomplex the heavy metal ions adsorbed on the surface of the soil particles, and then uses its own chelation to form a chelation body with the heavy metal ions, so that the heavy metal ions are removed from the soil. The soil is separated, but this type of method cannot completely eradicate pollutants, and subsequent technologies are needed to screen out chelates, which is costly

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