Mixing remediation method for heavy metal contaminated soil

Abstract

The invention relates to the technical field of contaminated soil control, in particular to a mixing remediation method for heavy metal contaminated soil. According to the mixing remediation method, an existing planting mode for heavy metal contaminated plant remediation is completely changed, remediation plants do not need to be cultivated in advance through a greenhouse and can be directly planted into the heavy metal contaminated soil, no requirement for the concentration of heavy metal ions in the soil exists, and thus the panting difficulty is greatly reduced; and an asbestos fiber clothis covered to form an isolation layer to effectively isolate the lower-layer heavy metal ions, the content of the heavy metal ions in the soil is decreased by adding a heavy metal treating agent intothe soil, through watering and film covering, the metal ions are subjected to complexing settlement, and the metal ions are absorbed through an absorption layer of concave-and-convex rod powder to prevent secondary contamination.

Description

technical field [0001] The invention relates to the technical field of soil pollution control, in particular to a mixed repair method for heavy metal polluted soil. Background technique [0002] With the continuous development of the global economy, soil heavy metal pollution has become a major problem facing the global environmental quality. Human activities (mineral mining, metal smelting, domestic wastewater discharge, use of chemical fertilizers and pesticides, etc.) have greatly accelerated the production of heavy metals on the earth. The chemical cycle makes the heavy metals in the environment continuously increase, which increases the harm of heavy metals to human health. When heavy metals entering the environment exceed their capacity in the environment, heavy metal pollution can occur. Heavy metal pollutants are persistent pollutants, and the harm to the environment and human body is difficult to eliminate. Heavy metals have the characteristics of strong chemical ...

AI Technical Summary

Problems solved by technology

[0004] The above heavy metal repair techniques all have a certain effect on heavy metal repair, but they also have their own shortcomings in practical applications.

Phytoremediation technology has limited types of plants for remediation, and its repair speed is slow, and the retreatment of plants that accumulate a large amount of heavy metals is also the main factor that limits the large-scale promotion of phytoremediation technology; microbial remediation technology generally only adsorbs a single heavy metal. The effect is good, and because the microbial organisms are small, the amount of heavy metals repaired is also small, so this also limits the application of using microorganisms for large-scale on-site repair; the electrodynamic repair technology is still in the experimental research stage, and due to different soil Different physical and chemical properties also have a series of limiting factors in practical application; soil leaching technology is complex and expensive;

[0005] Taking phytoremediation as an example, the existing methods mostly use greenhouses to pre-cultivate the repaired plants. After the seeds grow and develop into seedlings, they are then transplanted to heavy metal-contaminated plots for soil remediation. The cost of transplanting has increased significantly, and it is difficult to achieve mass production. Phytoremediation is currently in the state of experimentation or small-scale trial planting, which is far from idealized restoration

If the seeds are directly sown in heavy metal-contaminated soil, the seeds are difficult to germinate and the germination rate is extremely low. Even if some seeds germinate, the plants are difficult to grow. Because the seeds do not really grow up in the environment of heavy metal ions, it is difficult to exert the heavy metal absorption effect.