A Soil Remediation Method in Dust Settlement Area of ​​Open Pit Mine

Abstract

The invention discloses a soil restoration method in the dust settlement area of ​​an open-pit mine. Before the breeding period begins, the plants in the vigorous growth period are crushed and mixed with the dust layer and surface soil layer on the abandoned surface to form a mixed layer; the mixed layer is dug out and plowed layer, and then lay the mixed layer on the subsoil layer and add the activator to the mixed layer; then lay the plowing layer on the mixed layer; build a grid-shaped soil ridge on the plowing layer to separate the plowing layer into several rectangular spots Then level the soil in the patch; irrigate the soil in the patch after leveling; treat the soil surface with film to maintain the anaerobic state, and monitor the strong reduction environment: under anaerobic conditions, the mixed layer becomes a humus layer, and the treatment lasts for a week The redox potential of the soil in the post-humus layer is not higher than ‑170mV; plants can self-repair and grow in the soil environment after restoration. The soil remediation method of the present invention does not need to introduce foreign species, repairs in situ, and has short treatment time, high efficiency and low cost.

Description

technical field [0001] The invention relates to a soil remediation method, in particular to a soil remediation method in an open-pit mine dust settlement area. Background technique [0002] ‌With the rapid development of the utilization of coal resources, the open-pit mining mode of coal accounts for an increasing proportion. Coal (powder) dust is the main environmental pollutant in open-pit mining. Coal (powder) dust enters the environment in the mining area and surrounding areas A coal (powder) layer is formed on the soil surface. The main effects of coal (powder) dust deposition on soil and plant communities are as follows: coal (powder) dust forms a layer of crust-like structure on the soil surface, and it is difficult for plant litter to enter the soil layer through the coal dust layer for decomposition. Nutrients are reduced; soil coal dust has a large heat absorption capacity, which increases the temperature of the surface soil and reduces the moisture content of the...

AI Technical Summary

Problems solved by technology

Commonly used methods such as excavation and landfill, chemical passivation, and bacterial injection require a large amount of engineering, have secondary pollution risks, and the cost is relatively high. The existing restoration methods are not conducive to the actual promotion and use.