Method for improving acidified soil

Abstract

The invention provides a method for improving acidified soil. The method comprises the following steps: directly scattering and mixing a soil conditioner in soil; or mixing the soil conditioner with water into mud, scattering the mud on the surface of polluted soil, and mixing the mud with the soil to perform exchange adsorption with cationic heavy metal ions in the soil so as to reduce the dissolution rate of the cationic heavy metal ions in the soil. When the ratio of the total volume of the cationic heavy metal to the total amount of exchangeable cations of the conditioner is larger than 0.7, and the input of the soil conditioner in the soil is 0.71-77.21 g/l. The soil input of the soil conditioner is 6.72-30 g/l. The method has the advantages of being not only applicable to cadmium polluted soil and acidified soil containing lead ions and other cationic heavy metals, but also being applicable to influence of acid rain, fertilizers and the like, playing very good acid buffer capacity to soil containing acid sulfate, and improving all kinds of acidified soil polluted by cadmium and lead heavy metals. The cost is low, and the effect of reducing the dissolution of cationic heavy metals in the acidified soil is excellent.

Description

technical field [0001] The invention relates to a method for improving acidified soil, which is a method for ion-exchanging cationic heavy metals in acidified soil and reducing the dissolution amount of cationic heavy metals in acidified soil. It belongs to the technical field of soil improvement. Background technique [0002] At the construction site, due to the excavation of the soil layer containing pyrite and marcasite, or the excavated soil is piled up in the air as backfill soil, the soil is oxidized when it comes into contact with the air, which will form acidic Sulfate soil: In recent years, acidified soil formed due to the influence of acid rain, fertilizers, acid sulfate, etc., is easy to dissolve heavy metal cations and pollute the environment. Specifically, the impact of acid rain, fertilizers, etc., or the oxidation reaction of acidic sulfate soil, the exchangeable cations such as cadmium ions and lead ions contained in the soil are released into the interstiti...

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Problems solved by technology

[0006] Some soil improvement methods will produce toxic gases, high alkalinization of the so

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