Bioremediation method for heavy-metal contaminated soil of mining area

Abstract

The invention discloses a bioremediation method for the heavy-metal contaminated soil of a mining area, comprising the following steps: (1) applying thoroughly decomposed farmyard manure and superphosphate to the surface of the heavy-metal contaminated soil of the mining area, and spraying a biological surfactant which is rhamnolipid with the mass concentration of 1.5%; (2) ploughing, leveling and irrigating the heavy-metal contaminated soil of the mining area; (3) coating the alfalfa seeds with a microbial inoculum containing alfalfa-rhizobia; (4) coating the alfalfa seeds coated with the microbial inoculum; (5) treating Chinese wildrye seeds at low temperature; (6) mixing the coated alfalfa seeds and the Chinese wildrye seeds treated at low temperature, and sowing the mixed seeds into the heavy-metal contaminated soil of the mining area; and (7) carrying out field management after the seedlings emerge. Due to the adoption of the bioremediation method, the heavy metal in the heavy-metal contaminated soil of the mining area can be adsorbed and absorbed efficiently, and the residual heavy metals in the soil can be reduced. The bioremediation method has the characteristics of high remediation speed, good effect and large treating amount and is easy to operate and master manually.

Description

technical field [0001] The invention relates to the field of ecological environment protection, in particular to a bioremediation method for polluted soil in heavy metal mining areas. Background technique [0002] In recent decades, due to global industrialization, a large number of potentially toxic substances have been discharged into the biosphere, including heavy metals, which can enter soil, rivers, and groundwater through various channels. Heavy metals are pollutants that are difficult to control. They have a long incubation period, chronic accumulation of hazards, are not easy to be noticed by people, and are non-degradable. Once they enter the environment, they will produce persistent and series of pollution, which is not easy to be removed. Tailings ponds in metal mines are an important source of heavy metal pollution in the environmental system. Tailings are a kind of solid waste generated during the mining process. These wastes contain high concentrations of toxic...

AI Technical Summary

Problems solved by technology

[0006] However, at present, there are still few effective cases of bioremediation of heavy metal-contaminated soil in mining areas at home and abroad, especially in the study of soil treatment, plant species selection and phytoremediation mechanism.

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