Method for removing high-concentration iron-sulfur and heavy metal pollutants in acid mine wastewater

Abstract

The invention discloses a method for removing high-concentration iron-sulfur and heavy metal pollutants in acid mine wastewater, which comprises the following steps of: firstly, introducing the acid mine wastewater into an adjusting tank by using a water pump, and properly adding water into the acid mine wastewater in the adjusting tank according to the initial pH value of the acid mine wastewater to dilute the acid mine wastewater so that the pH value of the acid mine wastewater is increased to about 4; high-concentration iron ions in the wastewater are self-hydrolyzed to form Schwertmannite, and the Schwertmannite and heavy metal pollutants such as mercury, cadmium and arsenic are co-precipitated and removed; the iron-removed acid mine wastewater is filtered by the vertical underflow retarding belt, and the filtered acid mine wastewater enters the three-stage dynamic ecological filter tank and is subjected to physical adsorption, ion exchange, precipitation and the like; according to the method for removing the high-concentration sulfate ions, the iron ions and the heavy metal pollutants in the acid mine wastewater, the utilization rate of water is increased, the treatment cost is reduced, the water can be repeatedly recycled, and the method is environmentally friendly and free of pollution. And the continuity of the treatment effect is improved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a method for removing high-concentration iron-sulfur and heavy metal pollutants in acid mine wastewater. Background technique [0002] Since coal mines contain a large number of sulfide minerals that can exist stably in a reducing environment, such as pyrite, magnetite and other sulfides, when exposed to oxygen, they are further exposed to air, water and microorganisms. Under the combined action, a large amount of acid mine wastewater is formed. Mine wastewater has high iron and sulfate ion content, low pH, and many suspended solids, including various types of sulfides and a small amount of heavy metals; it has caused great damage to nearby rivers and the ecological environment. [0003] Most of the wastewater treatment adopts the conventional sewage treatment process of station construction. It requires tens of millions of funds for construction projects and equipmen...

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Problems solved by technology

[0005] In order to solve the environmental pollution problem that above-mentioned acid mine wastewater brings, the present invention provides a kind of method for removing high-concentration iron-sulfur and heavy metal pollutants in acid mine wastewater, the treatment method of this acid mine wastewater has improved the water utilization rate, has reduced Disposal costs, and can be reused, improving the sustainability of the governance effect

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