What are the two purification methods of air purifiers?

Let me first talk about the working principle of the air purifier. It sucks in contaminated air, then completes the purification through its own purification device, and then releases the clean air. The pollution sources we come into contact with in our daily lives are usually fine particles represented by PM2.5 and volatile organic compounds represented by formaldehyde. But in some other environments, such as hospitals, there may be air components such as bacteria and viruses. At present, most air purifiers use activated carbon adsorption to purify the air, but some manufacturers use photocatalyst and other technologies as auxiliary purification technologies. Today, let us briefly talk about the purification methods of air purifiers.

Purification method

Generally speaking, purification methods are divided into active directions, which can be divided into active purification methods and passive purification methods. The passive purification method only has a purification effect on the inhaled air; the active purification method has a purification effect on the entire space.

1. Active purification method

For fine particles such as PM2.5, the most common purification methods are electrostatic dust collection and fan + filter. Electrostatic dust collection is an air purification technology that uses air ionization to charge particles so that they are adsorbed by electrodes. Also known as active purification technology. Because it does not require high technological level and the cost is relatively controllable, this technology is currently widely used in a large number of domestic low-end air purifiers. And the advantages of this technology are obvious. Firstly, it is relatively quiet, because it does not require too much fan; secondly, it is low maintenance cost, no need to replace the filter element, and the dust collection module can be cleaned and used repeatedly. But the shortcoming is also very obvious, that is ozone. I believe everyone knows that ionized air is bound to produce ozone, and ozone is also one of the four typical air pollutants. It not only irritates the respiratory system, but also affects the human skin, nerves and immune system, and may cause cancer in severe cases. Based on this reality, air purifiers that use electrostatic adsorption as a single method are now prohibited from being used in places with people.

2. Passive purification method

The fan + filter type air purifier has become the passive purification technology scheme adopted by most brand air purifier manufacturers. In fact, the principle of the air purification technology of fan + filter is relatively simple. It uses a high-speed rotating fan to form negative pressure in the air around it. In layman's terms, it sucks dirty air into the air inlet and makes it inside the machine. Fully contact with high-efficiency filter materials, and release clean air from the air outlet after purification. Although it may seem simple, it is not. For example, the fan determines the purification speed and quietness; the filter determines the effect and service life; the outer shell determines the aesthetics and interactive experience, and so on.