System for auxiliarily treating acid mine waste water by utilizing stepped interception dams and process thereof

Abstract

The invention discloses a system for auxiliarily treating acid mine waste water by utilizing stepped interception dams and a process thereof. The system for auxiliarily treating the acid mine waste water by utilizing the stepped interception dams comprises at least three levels of interception dams, wherein the interception dams are distributed in a shape of naturally falling trapezoid so as to carry out primary treatment, neutralization treatment, reducing treatment and impurity eliminating treatment on the acid mine waste water. The system and the process disclosed by the invention have theadvantages that the stepped interception dams are established on a natural ditch by utilizing natural falls, and the functions of obstruction of the stepped dams, physical and chemical reaction of microorganisms, filtering and adsorption of plant roots and the like are also utilized, so that the process is a subsequent auxiliary and deep treatment method, the treating effect is improved, the complexity and treating difficulty of the traditional method are simplified, the cost is reduced, the water quality is improved, the heavy metal content and the acidity are further reduced, and the damages of the mine waste water to water source areas and ecological environment are reduced.

Description

technical field [0001] The invention relates to a system and a process for assisting the treatment of acidic mine wastewater by using cascade interception dams, and belongs to the technical field of sewage treatment. Background technique [0002] There are a lot of metal minerals and coal resources in the southwest of my country, and most of the metal mines exist in the form of metal sulfides. Under the action of oxygen and microorganisms in the air, the sulfides in the mined and abandoned metal mines or coal mines undergo After the process sulfate compounds are formed which dissolve in water. In this way, not only the concentration of heavy metal ions in the water is increased, but also the acidity of the water body is increased (that is, the pH value of the water body is lowered). [0003] At present, there are mainly physical methods (adsorption method), chemical methods (flocculation method, precipitation method, chelating agent method), membrane treatment method and ...

AI Technical Summary

Problems solved by technology

However, due to the large amount of waste residue generated by the treatment, it is difficult to handle and may cause secondary pollution and other problems.

[0006]Micro-electrolysis flocculation method: This method is mainly based on Fe-C filler, and uses the electrochemical corrosion effect of iron filings in wastewater. The combined effects of chemical electroenrichment of flocs, coagulation produced by electrochemical action, adsorption of new flocs and bed filtration, etc., its main disadvantages are reflected in: ①, the iron filings at the bottom of the electrolysis tower are easy to harden, which It leads to difficulties in the transfer of Fe-C electrons, and H+→H2 on the iron filings wraps the iron filings, making it difficult to oxidize and dissolve, thus reducing the treatment effect

② The iron-carbon micro-electrolysis reaction needs to be carried out under acidic conditions (pH is generally 3-4), which makes the control of pH an important issue

The discharge water is required to be neutral, and the contradiction between the two increases the operating cost

③. In the micro-electrolysis process, the anode reaction: Fe-2e-→Fe2+, needs to replenish iron filings and replace residues in time, which increases the difficulty of operation. After the water treatment reaction has been carried out for a period of time, unfavorable phenomena such as clogging and agglomeration appear. At the same time, there are problems of pH value adjustment before and after the micro-electrolysis reaction, which increases the cost.

However, since industrial wastewater often contains substances such as acids and alkalis, the treatment conditions are relatively harsh.

Moreover, the treatment cost of this method is high. Membrane treatment technology can effectively treat mine acid wastewater to a certain extent, but the service life of the membrane, the preparation cost and maintenance cost of the membrane prevent this technology from being widely promoted.

Images