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In the process of coal mining, a series of physical, chemical and biochemical reactions have taken place in the contact of groundwater with coal seams and strata, and the influence of human activities, so the water quality has significant characteristics of coal industry: the suspended matter content of mine water containing suspended matter is much higher than that of surface water, and the sensory properties are poor; Moreover, the suspended solids have small particle size, light specific gravity, slow settling speed and poor coagulation effect; The mine water also contains waste engine oil, emulsified oil and other organic pollutants. The total ion content of mine water is much higher than that of surface water, and a large part of it is sulfate ion. The pH value of mine water is often very low, often accompanied by a large number of ferrous ions, which increases the difficulty of treatment.

According to the requirements of discharge index, the mine water treatment usually adopts the treatment process of "advection sedimentation + coagulation sedimentation + multi-media filtration". If the effluent meets the reuse or surface discharge standard, the ultrafiltration / nanofiltration / reverse osmosis unit should be added after the multi-media filter for advanced treatment.

The mine water can be treated to underground reuse and surface discharge standards.