What Pollutants Does The Air Purifier Purify? You Have To Know These Four!
Jul 21, 2021
Air purifiers have been recognized by more and more people because of their role and convenience in air purification, which has also promoted the continuous growth and rapid development of the air purifier industry, and more and more companies have entered this industry. Just because everyone’s acceptance level is different, some people still don’t understand and accept air purifiers. The purpose of this article is to let everyone recognize the "true face" of the air purifier, so that everyone can understand its function and whether it matches their own needs. Today I will tell you which air pollutants can air purifiers play a role in.
1. PM10 (particulate matter with a diameter of ≤10 microns)
I believe many people have seen the value of PM2.5, especially in air monitoring, but not everyone understands what this value represents. In fact, PM is the abbreviation of English Particulate Matter (Particulate Matter). The 2.5 and 10 behind PM are the numerical values used to indicate the size of particles. The general unit is micrometers (1 meter = 1000000 micrometers). The larger the value, the larger the diameter of the particle. Particles with a diameter less than or equal to 10 microns are called PM10, and particles with a diameter of 2.5 microns and equal to 2.5 microns are called PM10. PM10 is generally like what we can see in the sun, including dust, pollen, clothing lint, pet hair, etc., all in the PM10 range. Because PM10 has a larger diameter, even if it enters the nose, it will be blocked by nasal hairs, and the nasal mucus will be resolved after waking up. If an air purifier is installed in the home, it will be intercepted directly on the first layer of filter.
2. PM2.5 (particulate matter with a diameter of ≤2.5 microns)
The main components of PM2.5 include: organic matter, nitrate, sulfate, ammonium salt, crust elements, metal elements, etc. The sources of PM2.5 include natural sources and man-made sources. The latter has a greater impact on air quality. Specific sources include motor vehicle emissions, coal combustion, construction site dust, and road dust. Because PM2.5 has a smaller diameter and is more likely to stay in the terminal bronchioles and alveoli, M2.5 has a greater impact on health than PM10.
3. Particles with a diameter in the range of 0.1-0.3 microns
The particulate matter in this range includes second-hand smoke, oil fume, automobile exhaust, industrial incomplete combustion produced by heating or power generation, and so on. Particles of this diameter may not be very effective if they only rely on general filters, because their Brownian motion is not obvious, and they basically walk straight by inertia, but they are much smaller than the space of the fiber capillary, so they are easier to be missed. At this time, HEPA (high efficiency) filter is used. HEPA filter is made of HEPA divided into PP (polypropylene) filter paper, glass fiber, composite PP PET filter paper, melt-blown polyester non-woven fabric and melt-blown glass fiber. The air is filtered through multi-layer stacking, and because the material is all paper, it is generally not washable. The standards for HEPA filters correspond to H11, H12, H13, H14, U15, U16, etc. According to relevant industry standards, the filtration requirement of the HPEA filter is that the filtration ratio of 300 nanometers is above 99.9%.
4. Harmful gases (such as formaldehyde, benzene, etc.)
Bacteria can also be filtered by HEPA, but HPEA filters can do nothing for toxic gases such as formaldehyde and benzene, because the molecular diameter of harmful gases is between 0.4 and 0.6 nanometers (1 micron = 1000 nanometers), while the diameter of oxygen molecules It's only 0.3 nanometers, so activated carbon adsorption is needed to solve this problem at this time. Just use activated carbon and pay attention to regular replacement, like HPEA filter, otherwise the problem of "secondary pollution" may occur after a long time. In addition, photocatalyst technology can be used to solve the problem, but the cost of this technology will be higher, and the photocatalyst technology has certain requirements for light, effective contact concentration, nanometer particle size, etc., so the use of photocatalyst needs to be combined with other technologies such as ultraviolet light. Row.
