Microbial remediation method applied to non-soil dressing mining area

Abstract

The invention discloses a microbial remediation method applied to a non-soil dressing mining area, which mainly utilizes the organic combination of various strains such as sulfate reducing bacteria, photosynthetic bacteria, nitrogen-fixing bacteria and the like to construct a healthy underlying microbial ecosystem on the surfaces of bare rocks and sandy soil, and the underlying microbial ecosystem can be self-balanced and self-grown under the illumination condition. By secreting extracellular polymeric substances to be adhered to the surfaces of bare rock and sandy soil to grow, water contained in the air can be efficiently absorbed to be supplied to microorganisms, and various repairing functions such as water retention, ecological environment improvement and plant root system development promotion are achieved. Sulfide generated by remediation is stable, low in solubility and environment-friendly and has a buffering effect, after a bottom layer microbial ecological system is constructed, heavy metal is fixed in the farmland in a sulfide mineral form, crops can efficiently and rapidly grow in the farmland polluted by the heavy metal, and qualified agricultural products are produced. And the used microorganisms are environment-friendly microorganisms, so that the environmental ecology can be fundamentally improved, and the durability is realized.

Description

technical field [0001] The invention relates to the technical field of environmental restoration, in particular to a method for regreening restoration of gangue slag microorganisms in non-guest soil mining areas. Background technique [0002] There are many kinds of mineral resources in Qinghai and other western regions of my country, such as Qilian Mountain coal-bearing belt, but there is serious chromium pollution. Chromium slag is a heavy metal hazardous waste, and the hexavalent chromium (Cr 6+ ) is soluble and unstable, has strong oxidative toxicity, and can cause damage to the human body and crops. Studies have shown that calcium chromate (hexavalent chromium) contained in chromium slag also has strong carcinogenic and mutagenic properties. Chromium slag without harmless treatment will seriously pollute surface water, groundwater and soil, and pose a huge threat to the ecological environment and the safety of people's lives and properties. For this reason, many plac...

AI Technical Summary

Problems solved by technology

Traditional chemical curing restoration techniques (such as figure 2 ) mainly uses chemical agents to react with heavy metal elements so that they are no longer leached by rainwater or absorbed by plant roots, but this cannot avoid the leaching of acid, iron and heavy metals mediated by autotrophic acidophilic microorganisms, so it is difficult to apply to heavy metals Continuously leaching polluted sites

In addition, the traditional vegetation restoration technology needs to use a large amount of foreign soil to cover the surface of the tailings pond before planting plants. This can only realize the regreening of the pile surface, but it cannot solve the problem of heavy metal leaching mediated by microorganisms in the deep part of the pile.

Moreover, due to acid leaching under rainfall on high and steep slopes of coal mine pits, it is difficult to grow green vegetation after spraying with traditional foreign soil.

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