Treatment method for acid mine water of closed coal mine

Abstract

The invention discloses a treatment method for acid mine water of a closed coal mine. The treatment method is suitable for acid mine water treatment of abandoned mines in inclined mine exploitation. The treatment method comprises the following steps: firstly, digging an underground tunnel at a shaft head before a coal mine is closed, wherein the underground tunnel is parallel to an original roadway; digging a connection channel at the top end of the underground tunnel and the original roadway; after the coal mine is closed, removing pollutants such as H<+>, suspended matters, iron, manganese and sulfate radical from the acidic mine water in the abandoned original roadway at the shaft head and the dug roadway; putting the treated effluent into an artificial wetland system, and further performing neutralization, adsorption, filtration, ion exchange, plant absorption and the like in the wetland system to remove the remaining H<+>, iron, manganese and other pollutants from the water, and discharging or reusing the effluent treated by the wetland. The method is simple to operate; by use of inexpensive materials such as limestone and closing of the original roadway of the coal mine, theland is saved; the pollution of the acidic mine water of the closed coal mine can be effectively solved; in addition, the treatment and maintenance cost is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a closed coal mine acid mine water treatment method suitable for abandoned mines mined by inclined shafts. Background technique [0002] When developing mineral deposits, the influx of atmospheric precipitation, surface water, groundwater and production water will form mine drainage. For coal mines mined in inclined shafts, the infiltration of atmospheric precipitation into the goaf is an important factor for the formation of acid mine water discharge, and the dissolved oxygen concentration in precipitation is usually 8-9mg / L. With the participation of sulfur bacteria, the sulfide in rocks is oxidized Acidic mine drainage is formed, and its pH value is generally between 3.0 and 6.5. This kind of acidic mine drainage has many and scattered discharge points, and the pollution area is wide, which seriously threatens the environmental safety of surrounding soil and ...

AI Technical Summary

Problems solved by technology

The neutralization method can effectively neutralize the acidity of the wastewater. After the neutralization method, the effluent may contain too much alkalinity, which will have an adverse effect on the water environment, and produce a large amount of calcium residue that is not easy to dehydrate. Improper treatment will also cause secondary pollution; Microbiological method is in SO 4 2- In a sufficient environment, microorganisms use organic matter as electron donors, and SO 4 2- As an electron acceptor, it oxidizes organic matter, obtains the energy needed for life through the dissimilation of organic matter, and at the same time converts SO 4 2- Reduction to increase the pH value of the effluent, this method is immature and has not been widely used; the wetland treatment method is to use the unique soil and matrix of the wetland system, the unique hydrological conditions and wetland organisms through adsorption, filtration, ion exchange, oxidation However, the effect of wetland treatment cannot be accurately predicted, and there is no specific design and operation standard at present. In addition, wetlands also occupy a large amount of land

[0004] The treatment facilities used in these treatment methods require fixed staff to maintain and operate, and the operation costs are expensive. Therefore, it is urgent to develop new technologies to reduce the discharge of acid mine wastewater from the source, and a treatment method with low operating costs to realize the treatment of acid mine water. Up-to-standard discharge or comprehensive utilization of water resources

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