Application of lysinibacillus fusiformis with MICP function in greening restoration of tailings

Abstract

The invention provides application of lysinibacillus fusiformis with an MICP function in greening restoration of tailings. The application comprises the following steps: taking quantitative slag around mine tailings in a mining area according to regional ecological environment characteristics, taking the slag back to a laboratory for liquid Yao culture, and screening microorganisms with an MICP function; according to a color developing agent result and a 16S analysis result, confirming that one strain is lysinibacillus fusiformis, and confirming the function of decomposing urea to induce calcium carbonate precipitation of the lysinibacillus fusiformis; determining the MICP function of the strain according to physicochemical properties of the strain, especially calcium carbonate precipitation reaction; on the basis of the MICP solidified alien soil regreening composite ecological restoration technology, adopting alien soil for planting plants to improve the ecological environment of the mining area, and realizing the tailing regreening effect. The application has a good tailing solidification effect, can solidify slag, has a promotion effect, namely a seed enhancement effect, on regional plant seed germination, and is beneficial to reduction of regional mine restoration technology cost.

Description

technical field [0001] The invention belongs to the technical field of treatment and recovery of destroyed mountain-heavy metal tailings, and in particular relates to an application technology of spindle-shaped lysine bacillus with MICP function in tailings greening restoration. Background technique [0002] The process of industrialization and rapid economic development has accelerated the destruction of natural resources and accompanied by environmental pollution. In the economically underdeveloped regions of the west, there is a lack of high-tech and new energy industries. In some places, the development model of breaking through the environmental carrying capacity to obtain economic benefits is popular. The indiscriminate mining and excessive digging of copper and silver mines have made the fragile mountains in the ecological transition zone riddled with holes, and the natural landscape, geological relics, tourism resources and ecological environment have been severely d...

AI Technical Summary

Problems solved by technology

[0005] (2) The MICP reaction system is optimized, and there is a lack of standards for the application amount of slag with different particle sizes

[0007] (3) The pure MICP tailings restoration technology leads to a single landscape pattern and low ecological benefits

[0008] Although the simple MICP solidification technology can fix the slag on the damaged mountain body and solidify free heavy metals, it has no practical significance for the restoration of regional vegetation. The solidified surface layer forms a hard shell, which is not conducive to the accumulation of soil moisture and nutrients in the northwest region where the ecological environment is fragile. cycle, and even cause a large area of ​​surface runoff, there is water loss, which is not conducive to vegetation restoration, resulting in loopholes in the sustainability of soil restoration and landscape restoration

[0009] (4) Lack of research on seed enhancement technology of MICP strains, limiting plant recovery technology in mining areas

The current MICP soil restoration technology is only limited to the in-situ passivation of heavy metals and the fixation of dust on the surface of slag. There are defects in the composite MICP bioremediation technology, which is not conducive to the sustainable ecological restoration of the tailings environment.

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