A heavy metal polluted soil remediation agent suitable for acidic farmland soil

Abstract

The invention discloses a remediation agent suitable for heavy metal polluted soil in acidic farmland soil, which uses the crop seeds to be sown as the core, and the heavy metal polluted soil remediation agent as the seed coat, and the seed coat layer of the heavy metal polluted soil remediation agent includes crop waste material fermentation layer, clay mineral layer and water-absorbing polymer layer, wherein, the crop waste fermentation layer is in contact with the seed coat, and the repair agent coating layer is coated on the outside of the crop seeds in the form of layer-by-layer coating, and is in contact with the crop seeds when they are sown. At the same time, it is applied to the soil, which simplifies the application process of the restoration agent. The restoration agent exists around the roots of the crops to improve the utilization efficiency of the restoration agent; the wheat coated with the restoration agent is planted in the soil polluted by heavy metal cadmium, and the heavy metal in the harvested wheat The content of cadmium is lower than the limit standard of pollutants in food, the reduction rate of cadmium in wheat has reached more than 76%, and the passivation rate of available cadmium in soil has reached more than 92%.

Description

technical field [0001] The invention relates to the technical field of heavy metal contaminated soil remediation, in particular to a heavy metal contaminated soil remediation agent suitable for acid farmland soil. Background technique [0002] Soil is one of the main material sources for people's survival. With the acceleration of the development of industry and agriculture, 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 total amount of heavy metals is reduced by completely removing heavy metals from the soil; including the absorption of hyperaccumulative plants, electric restoration, soil removal, soil replacement, soil leaching, etc. The remediation measures are large in quantity and high in cost, and are not suitable for mildly polluted soils in large...

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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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