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Methods of Air Purification

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The main purpose of air purifiers is the elimination of noxious gaseous substances and odors. Air purifiers can be divided into the following categories:
  Dust filters
  Ionic purifiers or electrofilters
  - Adsorption filters
  Photocatalytic filters
Click here to find useful tips on how to choose an air purifier.
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Dust filters. A typical dust filter is a cloth made of various fibers, capable of holding back particles 0.3 microns in size and larger. Following is the description of its operation process: the air first enters the filter; then with the help of a ventilator it goes through the cloth for several times; dust particles settle on the dust filter; clean air is finally released. Dust filters are especially popular in Europe and North America. Among the most famous brands using this technology (also known as HEPA – High Efficiency Particulate Air) are Bionaire (Canada) and Honeywell (USA). The Russian market of dust filters is introduced by the so-called “Petryanova cloth”.
ïëþñû äàííîé òåõíîëîãèè î÷èñòêè âîçäóõà Simple to use, middle price
ìèíóñû äàííîé òåõíîëîãèè î÷èñòêè âîçäóõà

Purification of dust particles only, VOCs are not eliminated;
High maintenance costs

Brends:    Bionaire ; Honeywell; HEPA; VENTA

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Ionic purifiers or electrofilters are a good means of purifying air of dust and soot. They do not provide protection of toxic contaminants, such as carbon monoxide, nitrogen oxide, formaldehyde and other harmful gaseous compounds. Moreover ionic purifiers produce ozone, which five times more toxic than the carbon monoxide. Formed by an electric discharge in oxygen, ozone is in fact a b oxidizing agent, which may cause serious respiratory ailments, such as bronchitis and asthma.
Ozone generation in ionic purifiers is caused by a high-voltage purifying element. In North America the ionic filtration technology is mainly introduced by the Bionaire and Honeywell brands; the Russian electrofilter market is represented by the “Super-Plus” model and by purifiers equipped with the Daikin (Japan) ionic filters. One of the main disadvantages of the “Super-Plus” purifiers is that they produce ozone right from the start of their operation.
The so-called “Chizhevsky Chandelier” is another example of the ionic filtration technology. While standard ionic filters trap dust particles, the “Chizhevsky Chandelier” devices leave the dust precipitate on walls and ceilings of a room they operate in. This makes them absolutely not applicable for use in non-industrial premises.
ïëþñû äàííîé òåõíîëîãèè î÷èñòêè âîçäóõà Simple to use, middle price
Ìèíóñû äàííîé òåõíîëîãèè î÷èñòêè âîçäóõà

Air purification of dust particles only, organic and toxic contaminants are not eliminated

Ìèíóñû äàííîé òåõíîëîãèè î÷èñòêè âîçäóõà Generation of Ozone

Brands:    Bionaire ; Honeywell; Super-Plus; Daikin; Ovion-S

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Adsorption carbon filters – can trap almost every gaseous compound with a molecular mass of more than 40 atomic units. Scientific investigations conducted have indicated that adsorption filtration does not provide any protection of light chemical compounds, such as carbon monoxide, nitrogen oxide and formaldehyde. This makes the adsorption technology not applicable for air purification of most city airborne contaminants.
Requirement for frequent filter replacement induced by the limited dust capacity of the devices is another great disadvantage of the described technology. Inopportune adsorbent replacement may transform the filter itself into a harmful contaminant. Most popular today are the Philips and Honeywell adsorption filters.
ïëþñû äàííîé òåõíîëîãèè î÷èñòêè âîçäóõà Trap toxic admixtures with a molecular mass of more than 40 atomic units; adsorb dust
Ìèíóñû äàííîé òåõíîëîãèè î÷èñòêè âîçäóõà

Not effective for controlling most of the city airborne contaminants

Ìèíóñû äàííîé òåõíîëîãèè î÷èñòêè âîçäóõà High maintenance costs
Ìèíóñû äàííîé òåõíîëîãèè î÷èñòêè âîçäóõà Inopportune filter replacement may turn the device into a harmful contaminant
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Photocatalytic filtration. This brand-new technology is based on photocatalytic oxidation of organic compounds to innocuous clean air components. Nowadays, Photocatalysis is the most efficient and cost-effective air purification technology. Scientists estimate this to be the main method of air purification in the 21st century..
Many people and motorists as in particular should have heard of the so-called catalysts – thermocatalytic car exhaust combustors. In these very devices oxidation of toxic substance takes place on the catalyst surface under the influence of high temperatures. Photocatalytic air purification is somewhat similar. In fact PCO is a representation of natural methods of air purification.
The most essential element of the photocatalytic process is the oxidation that takes place on the catalyst surface under the influence of a mild ultraviolet light with the wavelength of less than 300 nm. The reaction runs at a room temperature. One of its main advantages is that no accumulation of toxic admixtures takes place: noxious compounds decompose into innocuous air components, such as carbon dioxide, water and nitrogen.
The method of Photocatalysis is more than 20 years old. Several years ago the technology was applied to the mass production. Photocatalysis was the subject of five international conferences held from 1993-1999. Below is the list of some areas of application of the photocatalytic technology introduced there:
- Explosives factory (USA)
- Microelectronics production facilities (USA)
- The Boeing Company
- Car Exhibitions (Japan)
- Homes (Japan)
- Hospitals (pathogenic bacteria elimination)
- Allergic diseases treatment (Asthma, Bronchitis, etc.) (USA)
AIRLIFE purification systems are based on the method of the photocatalytic oxidation.

 

 

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  For more information  

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Comparison table of the main characteristics of the air purifiers

Canal systems

List of substances completely eliminated by the method of Photocatalysis

AIRLIFE photocatalytic air purifiers

What is the photocatalytic air purification?

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Phone: +7 495 923-7209, E-mail: airlife@airlife.ru
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