Soil conditioner for remediation of Cd/As combined pollution of paddy fields and preparation method thereof

Abstract

The invention provides a soil conditioner for remediation of Cd / As combined pollution of paddy fields and a preparation method thereof. The soil conditioner comprises the following components in partsby weight: 20-60 parts of iron-containing sulfate, 20-60 parts of activated silicate, 0-40 parts of calcium superphosphate and 0-5 parts of disodium ethylenediamine tetraacetate. The preparation method of the soil conditioner comprises the following steps: (1) crushing the components respectively and carrying out sieving with an 80-mesh sieve; and (2) uniformly mixing and then granulating the sieved fine powder, carrying out drying until the moisture content is less than 5%, and finally carrying out detection to obtain a qualified finished product. The soil conditioner has a synchronous passivation effect on soil Cd / As pollution, and at the same time can effectively reduce the absorption of Cd / As by aboveground parts of crops, block heavy metals Cd and As from entering the food chain, prevent damages to human bodies, and promote protection and sustainable use of land resources. The preparation process of the soil conditioner is environment-friendly and feasible and has a low cost.

Description

technical field [0001] The invention belongs to the field of soil heavy metal pollution control, and in particular relates to a soil conditioner suitable for Cd / As composite polluted acidic soil, a preparation method and application thereof. Background technique [0002] With the continuous growth of the world's population and the acceleration of industrialization, as well as people's irrational use of the environment, the problem of soil pollution has become increasingly prominent, seriously threatening people's production and life. At present, the paddy field soil in southern my country mainly has the following safety factors that threaten the quality of soil resources and sustainable use: [0003] (1) Heavy metal pollution sources have increased. First, due to the rich mineral resources in the south, the discharge of industrial "three wastes" caused by human activities such as metallurgy and mining has intensified; second, with the increasing use of agricultural chemical...

AI Technical Summary

Problems solved by technology

[0004] (2) The area of ​​soil acidification is serious

[0005] (3) The problem of secondary non-point source pollution caused by low-efficiency heavy metal conditioners in paddy fields

There are some unreasonable abuses in the application of pesticides, fertilizers and conditioners in paddy fields

It is difficult to come up with an effective solution to the heavy metal compound polluted soil, which will cause secondary pollution to farmland to some extent

[0006] The cadmium and arsenic complex polluted acidic soil caused by the above problems has brought hidden dangers to ecological balance and food quality and safety. The existing conventional soil conditioners have certain limitations in stability and sustainability, and will greatly change the soil quality. The pH level will bring secondary pollution and compaction to the soil. Therefore, it is urgent to apply efficient and ecological soil conditioners and technologies.

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