Activated Carbon in HEPA Air Purifiers
Saturday, February 27th, 2010Unless you’re an aquarium hobbyist or own a water purification system that uses carbon, the idea of activated carbon in HEPA air purifiers probably seems strange to you. Even if the concept isn’t completely foreign, most still don’t know exactly what activated carbon actually does.
What Does Activated Carbon Do In A HEPA Air Purifier?
The first time most people encounter activated carbon is in choosing HEPA air purifiers. When most customers begin searching for air purifiers, generally due to allergies or asthma, they really have no idea how they work. As they are further educated about HEPA air purifiers, however, they will learn that odors and chemicals are the cause of the vast majority of their respiratory problems. Most quality HEPA air purifiers are designed to take care of not only allergens, but also the odors and chemicals in the air as well.
Was Active Carbon Used Before HEPA Air Purifiers?
Oddly enough, we humans have been using activated carbon to filter water for a long time; as long as two centuries. Way back then, they already knew of activated carbon’s great absorption qualities. Beginning in the early 1900’s, activated carbon was produced and sold commercially in the form of a powder. Only used to remove taste or smell from water or color from sugar, we really didn’t know at that point exactly what all it could do for us. Once World War I was in full swing, it was discovered that it could be used in gas masks for protecting our soldiers from the chemical agents in the air. The soldiers also used it, as did their ancestors, for water purification. By this point, commercial activated carbon had evolved from powder form to a granular form, which was the beginning of activated carbon being used in even more other ways.
What The Word “Activated” Means
So, what is “activated” carbon, and is there such a thing as non-activated carbon? The heat used in “activating” the carbon drives the impurities out of the carbon itself, leaving places for the impurities of the water or air or whatever it is the carbon is filtering to reside. In a way, carbon can act sort of like a sponge, only instead of squeezing out its contents, one heats it out. Once the activated carbon is full, it can be reactivated by re-heating it, though this is considered to be impractical and dangerous. Non-activated carbon would basically be carbon that has stuff in it already, such as soot or charcoal.
Different Types Of Activated Carbon
There are a variety of types of activated carbon, and it is described in a variety of ways, but generally activated carbon includes a wide range of amorphous carbon-based materials. These materials have a high degree of porosity (lots of holes) and a relatively large surface area. Basically, this means it has excellent absorbent characteristics. These absorbent characteristics are why activated carbon works so well filtering air and water both.
Want to learn more about the HEPA Air Purifier? Check out HEPA Air Purifiers Info.