The key role of membrane technology in coal mine wastewater treatment and its application practice

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Coal mine wastewater, as a kind of industrial wastewater containing a large number of suspended solids, dissolved salts, heavy metals and organic substances, if it is discharged directly without proper treatment, it will cause long-term harm to the environment and seriously affect the safety of groundwater and ecological balance. Under the background of strict control of environmental pollution and promoting green development, it is very important to seek efficient and stable coal mine wastewater treatment technology. Membrane technology, with its unique advantages, has gradually become one of the core means to solve this problem.

The application of membrane technology in coal mine wastewater treatment background China's coal mine industry is huge, accompanied by huge wastewater discharge pressure. In view of the shortage of water resources and the tightening of environmental protection policies, the advanced membrane separation technology is an effective way to treat and reuse coal mine wastewater. Membrane technology can achieve solid-liquid separation at the physical level, efficient interception and removal of fine particles and dissolved substances in wastewater.

Membrane technology mainly includes ultrafiltration, nanofiltration, reverse osmosis and other forms, their working principle is based on the pore size of different semi-permeable membrane, through the pressure difference, concentration difference and other ways to promote the material in the wastewater for selective transmission or retention. For coal mine wastewater, reverse osmosis membrane can effectively remove salt and some heavy metal ions in the wastewater, nanofiltration membrane is good at removing organic matter and inorganic ions in a specific molecular weight range, and ultrafiltration membrane is mainly used to remove suspended matter and microorganisms in the wastewater.

In practice, the application of membrane technology in coal mine wastewater treatment has shown many advantages:

Efficient purification: membrane technology has a high removal rate of harmful substances in wastewater, and can achieve deep purification of wastewater, so that it can meet the reuse or discharge standards.
Easy to operate: high degree of automation, small footprint, easy to integrate into existing wastewater treatment systems.
Resource recovery: It can effectively recover useful components in wastewater, reduce resource waste, and realize the resource utilization of wastewater.
For example, a large coal mining enterprise has introduced an advanced reverse osmosis membrane treatment system to deeply treat mine wastewater. The system not only successfully removed most of the salt and harmful substances in the wastewater, but also greatly improved the reuse rate of the wastewater, greatly reduced the demand for fresh water, saved a lot of water resources costs for the enterprise, but also significantly reduced the negative impact on the surrounding environment, and realized the double improvement of economic and environmental benefits.

Conclusion and prospect In summary, membrane technology plays an important role in coal mine wastewater treatment. However, to give full play to its potential, it is necessary to continue to strengthen technology research and development, solve problems such as membrane pollution and membrane flux attenuation, and improve the stability and economy of membrane technology. In the future, with the continuous emergence of new materials and new technologies, membrane technology is expected to make greater breakthroughs in the field of coal mine wastewater treatment, and inject strong impetus into the green transformation of China's and even the global coal mine industry.

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