Heavy metal contaminated soil conditioner and plant and chemistry combined remediation method

Abstract

The invention discloses a heavy metal contaminated soil conditioner and a plant and chemistry combined remediation method. The heavy metal contaminated soil conditioner is a mixture of red mud and slaked lime. In the invention, the plant and chemistry combined remediation method is used, the pH of the soil is regulated by a chemical method, and heavy metals in the soil are absorbed by planting energy crops, hyperaccumulative plants and the like, thereby improving the soil properties, gradually reducing the content of heavy metals in the soil, finally achieving the purpose of soil remediation, improving the plant remediation efficiency, and being favorable to large-scale commercial application.

Description

technical field [0001] The invention belongs to the technical field of remediation of resources and environment, and in particular relates to a heavy metal-contaminated soil improver and a plant and chemical combined remediation method for heavy metal-contaminated soil. Background technique [0002] my country is rich in mineral resources, and the soil pollution caused by mining development is large and widespread, and the damage and pollution to the natural ecological environment are becoming more and more serious. It is a problem that cannot be ignored in the treatment of contaminated soil in our country. In particular, the reproduction mechanism of polluted soil in mining areas, the law of pollutant migration, and the goals and directions of treatment are different from ordinary polluted soil. Therefore, the ecological restoration of mines is becoming more and more important. The research on the restoration technology of heavy metal-contaminated soil in mining areas is It...

AI Technical Summary

Problems solved by technology

[0006] (1) At present, most of the hyperaccumulative plants used for soil remediation have short plants, low biomass, low disease resistance and natural disaster resistance, slow growth and long cycle, so the remediation efficiency and rate are low. It is difficult to obtain good economic benefits under the technical level, which limits large-scale commercial application and large-scale promotion

[0007] (2) In the hyperaccumulation experimental plants, generally a plant can only tolerate or absorb one or two heavy metal elements within a certain concentration range, and show some symptoms of poisoning to other heavy metals with higher concentrations in the soil, Therefore, the application of phytoremediation technology in the treatment of heavy metal complex polluted soil is largely limited.

[0008] (3) Plants are living organisms that need suitable growth conditions. They have certain requirements for natural conditions such as soil fertility, climate, moisture, salinity, total alkalinity, drainage and irrigation systems, and are polluted by acidic mines and mine water. The soil obviously cannot meet the needs of plant growth

[0009] (4) The root system of plants is generally shallow, and it is most effective in remediating shallow soil pollution, and the remediation ability for deep soil pollution and deep groundwater pollution is poor, and even has no obvious effect on polluted soil