Heavy metal contaminated soil remediation agent suitable for acid farmland soil

Abstract

The invention discloses a heavy metal contaminated soil remediation agent suitable for acid farmland soil. According to the heavy metal contaminated soil remediation agent suitable for acid farmland soil, crop seeds to be sown are used as cores; a heavy metal contaminated soil remediation agent is used as a seed coating; a heavy metal contaminated soil remediation agent seed coating layer comprises a crop waste fermentation layer, a clay mineral layer and a water absorption polymer layer; wherein the crop waste fermentation layer is in contact with seed coats, the heavy metal contaminated soilremediation agent seed coating layer is adopted to coat the outer sides of crop seeds in a layer-by-layer coating mode, the heavy metal contaminated soil remediation agent seed coating layers and thecrop seeds are applied to soil while being sown, the application process of the remediation agent is simplified, the remediation agent is applied around crop root systems, so that the utilization efficiency of the remediation agent is improved; the wheat coated with the restoration agent is planted in soil polluted by heavy metal cadmium, the content of the heavy metal cadmium in the harvested wheat is lower than the limit standard of pollutants in food, the reduction rate of the cadmium in the wheat reaches 76% or above, and the passivation rate of available cadmium in the soil reaches 92% or above.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil, in particular to a remediation agent for heavy metal-contaminated soil suitable for acidic farmland soil. Background technique [0002] Soil is one of the main material sources that people rely on for survival. With the acceleration of industrial and agricultural development, heavy metal-contaminated soil has become one of the environmental problems that need to be solved urgently. At present, the restoration of heavy metal-contaminated soil is mainly carried out from two aspects. One It is to reduce the total amount of heavy metals, and the method of completely removing heavy metals from the soil is used to reduce the total amount of heavy metals; including the absorption of super-accumulative plants, electric restoration, guest soil, soil replacement, soil leaching and other methods, guest soil for soil and other projects The remediation measures require a l...

AI Technical Summary

Problems solved by technology

[0002] Soil is one of the main material sources that people rely on for survival. With the acceleration of industrial and agricultural development, heavy metal-contaminated soil has become one of the environmental problems that need to be solved urgently. At present, the restoration of heavy metal-contaminated soil is mainly carried out from two aspects. One It is to reduce the total amount of heavy metals, and the method of completely removing heavy metals from the soil is used to reduce the total amount of heavy metals; including the absorption of super-accumulative plants, electric restoration, guest soil, soil replacement, soil leaching and other methods, guest soil for soil and other projects The remediation measures require a large amount of work and high cost, and are not suitable for mildly large-area polluted soil. However, the phytoremediation period is long, and the soil cannot exert its use value during the remediation period. The application of phytoremediation in farmland soil remediation is limited by the fact that cultivated land soil does not produce food at all; the second is to reduce the risk of heavy metal pollution; by changing the form of heavy metals in the soil, the heavy metals are changed from bioavailable forms to stable forms to reduce The biological activity of heavy metals can reduce the risk of heavy metals entering the human body through the food chain and endangering human health; mainly chemical passivation and stable immobilization. The main purpose of chemical passivation restoration is to repair heavy metal-contaminated soil, so that the available heavy metal content in the soil reaches the limit. Usually, it is necessary to add a large amount of heavy metal-contaminated soil remediation agent to the soil, and the remediation process is complicated, and additional heavy metal-contaminated soil is added. Restorative agents need to consume a lot of manpower and material resources. On the other hand, applying repair agents to large areas of polluted soil often leads to waste of repair agents, and the restoration agents cannot effectively play their purpose of reducing the risk of heavy metal pollution.

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