Method for treating mine waste water in cold and drought region

Abstract

The invention discloses a method for treating mine waste water in a cold and drought region. The method comprises the steps of mine waste water preprocessing: solids in mine waste water is removed through a sedimentation manner; biochemical treatment: the pre-processed waste water is introduced into a distributing well below a frozen earth layer to perform biochemical treatment, halophilic microorganism active sludge fills the bottom of the distributing well, and outlet water on which biochemical treatment is conducted meets irrigation water standards; when the temperature in the distributingwell is lower than the surviving temperature of the halophilic microorganisms, and hot air is blown into the distributing well through an aeration device to maintain the temperature in the distributing well to be higher than or equal to 120 DEG C. The method has the advantages that the treatment on mining waste water can be run for years in the cold and drought region with lower cost the method isnot affected by external temperature, terrain foliage can be nursed by using metabolic products of the microorganisms, and the method is suitable for the vegetation recovery on cold and drought western sandy lands or the reclaiming of a mining area.

Description

technical field [0001] The invention belongs to environmental engineering water treatment technology, in particular to a method for treating mine waste water in cold and arid areas. Background technique [0002] Most of my country's mineral resources are distributed in the cold and arid areas of the west. These areas are mostly located in mountainous areas, where water resources are scarce. Most of the surface water is intermittent rivers. The evaporation is much greater than the precipitation, and the perennial flow dilution ability is poor. However, the development of mineral resources will inevitably cause damage to the stratum, groundwater flow field and surface, resulting in serious damage to the ecological environment of the mining area, and the problem of water resource shortage has become increasingly prominent. At present, 40% of mining areas in my country are seriously short of water. [0003] my country's water resources and coal resources are in reverse distribut...

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Problems solved by technology

However, recently, various provinces and cities have introduced measures related to the comprehensive utilization of mine water and water resource protection. For example, the Inner Mongolia Autonomous Region's "Special Action for Environmental Protection of Drinking Water Sources" requires that the original drainage outlets be closed, and wastewater will no longer be discharged into surface water sources, or the drainage water quality will reach At the same time, it is not uncommon for mine water to be discharged into windbreak forests or other vegetation soils, causing salinization and even plant death. The storage, reuse and discharge of a large number of mine water that slightly exceeds the standard in mining areas is facing huge environmental pressure.

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