Ecological remediation technique for use in contamination control of phosphorite waste land

Abstract

The invention aims to provide a phosphorite waste land ecological remediation method capable of controlling loss of contaminants. In the invention, a medium with a low hydraulic conductivity and high saturation degree is used as a covering medium for waste phosphorite to be combined with coarse sandy soil to form a covering protective layer, and the covering mode of the covering layer is that thecovering medium, coarse sandy soil and a phosphorite layer are covered in turn. The covering protective layer effectively prevents upper water from contacting lower phosphorite, so the leaching loss of the phosphorite contaminant is avoided; then plants are planted, so that the roots of the plants can fix the covering soil; and thus, the phosphorite waste land ecological remediation technique having a contamination control effect is formed.

Description

technical field [0001] The invention belongs to an ecological restoration method for mine development, in particular to an ecological restoration method for phosphate rock waste land with pollution control function, including the screening, covering and efficiency evaluation method of protective layer, and the ecological restoration method of phosphorite waste land. Background technique [0002] Phosphorus is a mineral element that causes lake eutrophication, and is mainly stored in the earth's crust in the form of phosphate rock. Phosphate ore mining causes a large number of phosphate-rich rock layers to be exposed on the surface, causing phosphorus, fluorine and other polluting elements contained in phosphate rock to enter the supergene environment, and are easily leached into the surrounding water environment under the action of natural weathering. In addition to the geological disasters such as subsidence, cracking, and landslides that exist in mine development, the impa...

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Problems solved by technology

Water and soil loss occurs in the abandoned phosphate rock wasteland, and the loss of pollutants is particularly serious

However, planting plants directly in waste phosphate mines will accelerate the leaching of pollutants. Studies have shown that the number and ability of phosphorus-dissolving bacteria in the rhizosphere microenvironment of plants are much higher than those in non-rhizosphere soils. (1) , the decomposition of plants and the metabolism of microorganisms accelerate the decomposition of phosphate rock

In the past, when repairing phosphate mines, the decomposition effect of plants on phosphate rocks was not considered. This repair method will accelerate the loss of pollutants and fail to achieve the purpose of pollution control.

There is no mature technology for pollution control of phosphate mine waste

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