Artificially promoted repair method of high iron content underground aquifer damaged by coal mining

Abstract

The invention discloses an artificially promoting repairing method for a high-iron-containing underground water-containing layer damaged by coal mining. According to the development characteristics and distribution range of mining overburden rock water diversion fractures, oxygen-containing water or weak alkali water recharging drilling holes are constructed in the mining area boundary and the middle corresponding ground surface; the mining fractures are blocked through Fe(OH)3 flocculation sediments generated by an oxidation reaction between iron components in the water-containing layer and oxygen-containing water or weak alkali water, and water leakage channels in the water-containing layer are blocked; the generated Fe(OH)3 flocculate can gradually precipitate within a certain range near recharging drilling hole end holes to form an iron active filter membrane, the catalyst effect is achieved on an oxidation reaction of iron (or ferrous) ions, the blocking effect on the fractures and the iron-removal water-purifying function are effectively guaranteed, and the water-containing layer can be promoted to be gradually repaired to the original state; and meanwhile, iron-removal clearwater resources drained at the terrain low-lying position of a downhole goaf are delivered and drained through pipelines for reusing of production of other downhole excavating working faces or groundproduction and life.

Description

technical field [0001] The invention relates to an underground aquifer protection and restoration method, in particular to an artificially accelerated restoration method suitable for the field of stratum aquifer restoration and water resource protection in coal mining areas where the high-iron-containing underground aquifer is damaged by coal mining. Background technique [0002] Underground coal mining will cause the movement and destruction of the overlying strata, thereby forming mining fissures in the overlying rock. The mining fissures in the overlying rock not only provide a channel for regional water loss, but also become the geological source of ecological environment damage in the mining area. Therefore, how to control the development of water-conducting fissures in mining overlying rocks and seal the leakage channels of underground aquifer water resources, so as to improve and protect the ecological environment of coal mining areas, is a major technical problem face...

AI Technical Summary

Problems solved by technology

These iron-rich underground aquifers are not only directly damaged by coal mining, but their water resources are also difficult to efficiently recycle

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