Ecological rehabilitation method for contaminated soil in copper mining area

Abstract

The invention belongs to the technical field of soil ecological rehabilitation, and discloses an ecological rehabilitation method for contaminated soil in a copper mining area. The ecological rehabilitation method comprises the steps: large pumice stone on the surface of soil land in the contaminated mining area is cleared, and the to-be-rehabilitated soil is turned over, broken and sun-cured repeatedly for two to three times; an appropriate amount of urban sludge is added into the sun-cured soil in the mining area, after stabilization for 20-30 days, the soil is turned over again, and a drainage ditch and a water collecting pool are designed; and on the stabilized and turned-over soil in the mining area, dayflower seeds are sown, or dayflower seedlings are transplanted, and vegetation restoration is achieved. The urban sludge is selected as an additive, the content of nutrients in the soil in the mining area is increased, the normal demand of plant growth is met, and the urban sludgeis also treated and disposed; the improved contaminated soil in the copper mining area is rehabilitated through hyper-accumulated plants, namely dayflower, and double pollution caused by sludge addingis avoided; and the urban sludge is used for plant restoration of the soil in the mining area, waste is treated by waste, and thus good economic and environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of soil ecological restoration, and in particular relates to an ecological restoration method for polluted soil in a copper mining area. Background technique [0002] Currently, the closest prior art: [0003] The development of mineral resources has made great contributions to my country's economic construction, but due to rough mining methods and improper management, it has also caused a large area of ​​abandoned mining sites and soil heavy metal pollution. These waste soils polluted by heavy metals have seriously damaged the ecological environment around the mining area, and directly or indirectly threatened the life and health of surrounding residents through various means. [0004] Traditional remediation methods for abandoned soil in mining areas include engineering remediation, physical and chemical remediation, etc. These methods can reduce the pollution of heavy metals in soil to a certain extent,...

AI Technical Summary

Problems solved by technology

Although this method can play a role in repairing the abandoned mine soil, due to the poor physical and chemical properties of the soil in the mining area and the low nutrient content, there are problems such as low plant survival rate and difficult growth.

[0006] In summary, the existing problems in the prior art are: (1) methods such as engineering restoration and physical and chemical restoration have limitations, such as large investment, difficulty in large-scale treatment of polluted soil, and decreased soil activity after treatment.

[0007] (2) In the phytoremediation method, due to the poor physical and chemical properties of the soil in the mining area and the low nutrient content, the existing technology for repairing the abandoned mine soil has problems such as low plant survival rate and difficult growth

[0008] (3) In the process of phytoremediation, it is generally necessary to improve the soil in barren mining areas. At present, chemical methods are commonly used, that is, adding chemicals for conditioning, which increases the cost, and also easily changes the physical and chemical properties of the soil and causes secondary pollution.

[0009] Difficulties in solving the above technical problems: (1) For the limitations of engineering restoration, physical and chemical restoration and other methods, there is no good solution at present, and the joint method of engineering + phytoremediation is often used to avoid its single use. The problem

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