Bioremediation method for arsenic-containing tailings or waste residue

Abstract

The invention discloses a bioremediation method for arsenic-containing tailings or waste residue. An arsenic-containing tailings dam and a waste residue pile are subjected to quick on-site remediation by artificially transplanted pteris vittata and Chinese silvergrass. The tailings dam and the waste residue pile are flattened, and bulkhead dams and gutters are established; the pteris vittata and Chinese silvergrass are transplanted to the tailings dam and the waste residue pile; in the next year, the tailings dam and the waste residue pile grow normally; and after 2 to 3 years, a stable pteris vittata-Chinese silvergrass dominant plant community can be formed, and 10 kinds of arsenic-resistant plants are naturally settled simultaneously. After the vegetation of the tailings dam and the waste residue pile is recovered, the wind erosion and water erosion are eliminated, and the arsenic content in storm dripping and filtration water of the tailings dam and the waste residue pile is reduced from 5mg / L before remediation to 100 mu g / L.

Description

technical field

[0001] The invention belongs to the field of reclamation, ecological restoration and land restoration of mine abandoned land, namely realizes rapid ecological restoration of arsenic-containing tailings ponds through biotechnology, and eliminates environmental pollution and health threats of the tailings ponds to surrounding areas. Background technique

[0002] Arsenic is an ore-forming element, and arsenic is commonly found in non-ferrous metal deposits. Mining and smelting of non-ferrous metals bring arsenic into the environment, causing serious pollution. In the process of mining, beneficiation and smelting, a large amount of waste rock, tailings and smelting waste residues are generated. Because they have not been effectively treated, they are deposited in the mining area, forming tailings dams and waste residue piles. These tailings dams and waste residue piles not only occupy a large amount of The land will also release a large amount of pollutants into...