Method for treating mine acidic wastewater by means of mixed packing of organic matter and carbonatite

Abstract

The invention discloses a method for treating mine acidic wastewater by means of mixed packing of organic matter and carbonatite. A closed reaction area is divided into a plurality of levels of processing units; the organic matter and the carbonatite are fed into each processing unit; the mixing ratios of the organic matter to the carbonatite of all the processing units are different; the organic matter at the front end accounts for larger proportion; the proportions of the organic matter along the direction of a reaction tank are gradually reduced; the mixture only contains the carbonatite in the last level; all the levels of processing units are arranged level by level in a stair manner, the front processing units are high, and the rear processing units are low; and water inlets and water outlets of all the units meet the requirements of upper inlet and lower outlet or lower inlet and upper outlet and stable water flow. The method has the advantages of good effect, low investment and low wastewater treatment cost.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and specifically relates to a method for removing Fe in mine acid wastewater by using organic matter and carbonate rock mixed fillers. 2+ , Mn 2+ , Zn 2+ Waiting for (heavy) metal ions to increase the pH of wastewater. Background technique [0002] Coal, as one of the most important energy sources, has produced a series of environmental problems along with the massive mining of coal. Among them, acid coal mine wastewater (AMD) is a prominent environmental problem. AMD has the characteristics of low pH value, high salinity and strong corrosion, and carries a large amount of heavy metal elements and harmful chemicals, causing local water, soil environment and environmental pollution. The ecosystem has been severely damaged. A large number of abandoned small coal mines (mines) are large in number and widely distributed, and mine drainage usually has a small flow rate, a low pH value...

AI Technical Summary

Problems solved by technology

As a simple and reliable method, the neutralization method is widely used in the treatment of AMD, but the consumption of a large amount of neutralization reagent will generate a large amount of sludge, which is easy to cause secondary pollution to the environment; the sulfide precipitation method has a good removal effect, However, the pH value is difficult to control, the sulfide precipitant is more expensive, and the treatment cost is high; the artificial wetland method is widely used in some developed countries to treat acid mine drainage. This method has low investment, low operating cost, and convenient management, but it occupies a large area , is obviously affected by environmental factors. When the acidity is high, the improved wetland method has certain limitations in the treatment of AMD.

For this reason, people are continuously improving and exploring the treatment method of acidic wastewater from mines. Chinese Patent Publication No. CN1618742 on May 25, 2005 disclosed a "method for the source treatment of acidic wastewater from nonferrous metal mines". The waste that produces in the mine beneficiation process is treated with waste, but this method has certain limitations for non-ferrous metal mines; Chinese Patent Publication No. CN1508079 on June 30, 2004 disclosed a kind of "preventing mine from producing acidic wastewater The method ", using lime milk to carry out saturated spraying around the mine, and laying waterproof materials on its surface, this method can control mine wastewater from the source, but it is difficult to implement, and there are certain risks; Chinese Patent Publication No. CN1418831 was published in 2003 On May 21, "a method for treating non-ferrous metal acidic wastewater" was disclosed. The method is one-stage lime neutralization plus two-stage polyferric sulfate precipitation to treat non-ferrous metal acidic wastewater. This method has a large amount of sludge and is prone to produce secondary secondary pollution

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