Acid mine drainage OLWS method

Abstract

The invention discloses a coal mine drainage OLWS method. The method comprises the following steps: collecting mine drainage A in a drainage collecting pool; 2, adding a quantitative amount of the mine drainage A with the pH value of alpha to a natural oxidation system in order to form a sulfuric acid / ferric sulfate solution; 3, adding acid mine drainage B obtained in step 2 to a filter material neutralization system with a calcium carbonate-containing filter material as a main component in order to rise the pH value of acid mine tailing drainage; and 4, discharging mine drainage C obtained in step 3 into wetland, wherein a multi-matrix filler is placed in the wetland, and plants capable of easily absorbing the mine tailing drainage resistant component environment are planted, and the mine drainage C can effectively stay and can be adsorbed by the wetland. The method has the advantages of long action time, strong processing capability, high efficiency, convenient construction, low running cost and maintenance cost, and completely no power.

Description

technical field [0001] The invention relates to a mine wastewater OLWS method. Background technique [0002] Acid Mine Drainage (AMD) is caused by the oxidation of sulfide minerals and is closely related to the action of microorganisms. The sulfate content of AMD is high and the pH value is low, and the discharge of such wastewater is very serious to the destruction of the ecological environment. [0003] There are many ways to treat acid mine wastewater at home and abroad, which can be roughly divided into "active treatment" and "passive treatment" methods. Active treatment mainly includes neutralization method, sulfide precipitation method, aeration oxidation filtration method, etc. Among them, the neutralization method is widely used in the treatment of AMD in my country as a simple and reliable method. Commonly used neutralization agents include limestone, calcium carbonate, calcium hydroxide, caustic soda, etc., but a large amount of sludge generated during the neutra...

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Problems solved by technology

Among them, the neutralization method is widely used in the treatment of AMD in my country as a simple and reliable method. Commonly used neutralization agents include limestone, calcium carbonate, calcium hydroxide, caustic soda, etc., but a large amount of sludge generated during the neutralization process ( Contains a large amount of heavy metals and toxic and harmful substances) is very likely to cause secondary pollution to the environment, and at the same time the operating cost and management cost are high; the sulfide precipitation method is to add sulfide reagents to the sewage to make the metal ions in the sewage form sulfide precipitation, Commonly used vulcanizing agents mainly include: sodium sulfide, sodium hydrogen sulfide, hydrogen sulfide, calcium sulfide, iron sulfide, etc. The sulfidation precipitation method has a high removal rate of heavy metal ions, strong adaptability to wastewater treatment, and is conducive to the recovery and utilization of heavy metals. , but the pH value is difficult to control, and the treatment cost is high. When the temperature control is not good, it is easy to produce hydrogen sulfide gas to pollute the air; the aeration oxidation filtration method has a good effect on removing heavy metals such as Fe and Mn in acid wastewater, but its treatment structure Many (requires pretreatment), high power consumption, high maintenance cost

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