For many waste water and sewage formed by the mining and application of deep coal resources, if not effectively recovered and applied, it will seriously damage the mine water resources, thus causing the mine to face the situation of water shortage.
In view of this, it is very urgent to realize the application of deep mine sewage treatment and sewage recycling.
In the following, the author briefly analyzes the related issues of deep mine sewage treatment and water resources application.
The significance of sewage treatment in deep coal mines and the application of sewage resources
Since a lot of salinity substances exist in sewage, if mixed with groundwater, it will affect the water quality of residents, which is not conducive to the production and development of coal mining enterprises, as well as the stable, healthy and cyclic development of the coal industry. . In view of this, the treatment of coal mine sewage and the application of sewage recycling are extremely critical.
Defects faced in deep mine sewage treatment methods
The exploration of the problems faced in the process of sewage treatment in deep mines should be based on the inherent process technology of sewage treatment in deep mines, and the entire process and links of sewage treatment should be truly clarified.
Among them, after the generalization, it is found that the deep well coal mine sewage treatment process faces the following problems:
First, the network fence has not been designed in front of the adjustment tank, so it is difficult to effectively intercept the floating objects in the sewage, resulting in a lot of large particle floating objects flowing into the adjustment tank, which greatly increases the probability of blocking the lift pump.
In addition, in the process of designing a domestic sewage treatment device, the overall quality of the filter screen material is often ignored, which will reduce the treatment effect of the filter screen.
Second, when workers add coagulants to the adjustment tank, they often do not remember to mix the coagulant effectively, thereby increasing the hydraulic load on the surface of the sedimentation tank, which will greatly reduce the operating efficiency of the filter tank.
Although some disinfectants are added during treatment, it is difficult to effectively optimize the water quality.
The third is the lack of rationality and scientificity in the plane of some architectural objects in the design. Under the background of the current increasingly tense land use, it is necessary to scientifically and rationally design the application functions of the building, and to reduce the land area as much as possible.
For example, it is possible to jointly build a clear water pool, an intermediate pool, and a waste water drainage pool.
Fourth, because of the relatively scattered design of water supply devices in coal mines, there are many duplicated construction facilities, which will reduce the application rate of water resources in mining areas to some extent. Also, it wastes a lot of money and equipment.
Fifth, the coal mine circulating cooling water system has not been configured scientifically. For example, if the cooling equipment and the cooled equipment are configured in the same way, it will seriously affect the work of the entire circulating cooling system, resulting in a great waste of energy, and ultimately it is difficult to achieve the ideal. cooling effect.
Sixth, it can be used for secondary application of underground drainage in coal mines to serve as dust-proof water or grouting water, and can also be treated in depth to meet the drinking water indicators, as well as saving resources and reducing operating system costs.
The method of deep mine sewage treatment
One is coagulation.
The coagulation method refers to the method of forming a chemical reaction (flocculation reaction, neutralization reaction) with the sewage by adding a coagulant, and implementing the multi-media filtration operation and the inclined tube sedimentation of the deep well sewage.
After the filtration operation and the inclined tube precipitation, it should be ensured that a series of parameters of the sewage are in line with a series of requirements of the sewage discharge index, and it should be discharged in the clear water tank.
The second is biological oxidation.
Biological oxidation refers to the effective treatment of deep well sewage through the characteristics of microorganisms. The biological oxidation method effectively unifies the advantages and characteristics of the activated sludge method and the biological filter method, and belongs to the relatively advanced deep mine sewage treatment method applied today.
The theoretical basis of the biological oxidation method is to add a corresponding amount of filler to the conditioning tank, so that the sewage can be contacted by the filler and its biofilm at a certain speed. So as to achieve the ideal water purification effect.
The third is the mixed method.
The mixing method is a method often used in the treatment of deep well sewage.
In the case of advanced treatment of sewage by mixing method, the quantity and type of coagulant selected will affect the effectiveness of sewage treatment.
Therefore, it is necessary to configure the coagulant according to the corresponding specific gravity, so as to effectively treat and purify the sewage.
The fourth is the double membrane method.
The double membrane method unifies the reverse osmosis method and the ultrafiltration method. It first performs ultrafiltration pretreatment, thereby greatly improving the quality of reverse osmosis water quality.
The reverse osmosis effluent and the ultrafiltration effluent should be mixed with the corresponding specific gravity, so that the final discharged water can be unified with the indicators of domestic water and production water.
Application of Sewage Resource in Deep Coal Mine
Sewage from deep mines can be divided into domestic sewage, underground drainage from deep mines, and other waste water. After these types of sewage are treated, generally speaking, they will be used as domestic water, agricultural water, and production water.
The components of the deep mine sewage treatment system engineering are pre-conditioning system, sand filter system, ultrafiltration drinking water system, coal slime treatment system, high-efficiency sedimentation system and so on.
The first thing the sewage from deep mines reaches is the preconditioning system, and operations such as sludge separation, flocculation electrolysis, and stirring are carried out in the high-efficiency sedimentation system, so that most of the pollutants in the sewage can be removed, and then filtered by the homogeneous filter material. The supernatant will enter the pool to remove the biological suspension, and then carry out ultrafiltration purification treatment.
In this way, it can be ensured that the water quality is in line with the discharge indicators required by relevant departments in my country. The coal slime in it has other application values.
The water quality treated by this process can be directly used as the domestic water for residents, thereby effectively alleviating the local shortage of water resources.
To sum up, the treatment of deep coal mine sewage and the application of water resources are a systematic and complex project. In the process of optimizing the inherent coal mine sewage treatment process, we need to formulate and improve the corresponding laws and regulations. In order to ensure that the treated sewage complies with the standards promulgated by relevant departments in my country, it can ensure the sustainable application of water resources in the coal mining area, and ultimately promote the stable and healthy development of domestic coal mining enterprises.