The application of magnetic separation technology in environmental protection is a very common phenomenon, our daily life: can be seen everywhere. From electronic equipment and power systems to communication-based dynamic control, magnetic effects and magnetic materials are used everywhere. And with the development of magnetic technology, its scope should be extended to the fields of biological science, agroforestry science and even emerging environmental science.
As we all know, coal accounts for a considerable proportion of the fuel used in industrial and agricultural production. However, most of the coal mines contain a large amount of carbide components, which will produce I sulfur dioxide gas harmful to the environment and pollute the environment. If there is a method to separate the sulfurized components in the coal, the sulfur dioxide can be eliminated from the environment. Poison = harm. Now, this effect can be achieved by using magnetic separation technology: the ground coal powder is passed through a high gradient magnetic separator, and the magnetic force in the high gradient magnetic field is not due to the different magnetic susceptibility of sulfide and coal (carbon). The same, thus playing the role of separation. Through the test = verification, one treatment can remove 40% and 60% of the sulfide in the coal, and the removal can be achieved by multiple treatments. Moreover, this: the magnetic separation desulfurization method has been tested and proved to be practically usable in terms of efficiency and economic cost, so there may be broad development prospects in the future.
Another technical problem in environmental protection is how to shorten the stop aeration time in the biochemical reaction tank during the sewage treatment process to improve the sewage treatment speed. One solution is to find more suitable microorganisms in the living sludge; another method is to add an enzyme to the sludge to speed up the reaction, and the enzyme plays a chemical reaction in the biochemical reaction. The role of the catalyst itself will not decrease. However, recovering enzymes from biological products and sludge is a problem. The magnetic separation technique can be used here again; it can be separated by a high gradient magnetic separator using the difference in the magnetic susceptibility of the enzyme and the sludge. In addition, a certain intensity of the magnetic field can promote the growth and reproduction of some microorganisms, so that the microorganisms in the sludge increase the reaction speed and speed up the treatment of sewage.
There is also a magnetic separation method in which a ferromagnetic magnetic powder (for example, a fine powder of Fe34, called a magnetic seed) is added to water, and the harmful substances in the water are adsorbed by the magnetic powder, and then they are sucked by a magnetic separator to be removed. In order to improve the adsorption efficiency, a flocculant such as aluminum hydroxide (Al(OH)3) may be added, and the separation method may be used to separate bacteria, viruses, synthetic detergents and heavy metals (such as mercury) from sewage, especially industrial wastewater. Hazardous substances (Hg), lead (Pb), chromium (Cr), etc. In particular, heavy metals that are the most harmful to biological hazards and are extremely difficult to remove are not treated by biological methods, and are also toxic to microorganisms; they are extremely difficult to remove by chemical methods (very small amounts of heavy metals have great harm to living things, such as Well-known methyl mercury (HgCH4), lead and base cream (As4O3) are highly toxic. The magnetic separation method uses physical action to remove it. If some technical problems are solved, this technology is expected to develop into a very simple and easy method in the future.
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