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UV APCO In Duct Air Purifier

UV® APCO® is a device intended for use as a residential or commercial indoor air purifier with the  additional  benefit  of microbial growth  disinfection on air system interior surfaces. APCO® is typically installed in the supply-side ductwork of a furnace  or air handling  system  (return-side  installation  is acceptable when necessary). The APCO® system is specifically designed to reduce  odors and volatile organic compounds (VOCs) and microbes in the indoor environment.

APCO® combines  three  proven  technologies in a  novel  approach   to  indoor  air cleaning and surface disinfection.

UV-C Light
Ultraviolet (UV) light is electromagnetic radiation  with a wavelength shorter  than that of visible light, but longer than X-rays, in the range 10 nm to 400 nm. For over a century scientists have known about the germ-killing properties  of ultraviolet light. The UV-C band ranges from 200 nm–280 nm with 254 nm being optimal for microbial disinfection. UV-C light disrupts the DNA of micro-organisms  which prevents  them from reproducing, thereby effectively killing them.

Activated Carbon
Activated carbon, is a form of carbon that has been processed to make it extremely porous and to create a very large surface area available for adsorption or chemical reactions. Due to its high degree  of microporosity, just 1 gram of activated carbon has a surface area in excess of 500 m2 (about  one tenth  the size of an American football field). The activated carbon used within APCO cells is derived from coconut  shells.

APCO® carbon cells are infused with titanium dioxide

Photocatalytic Oxidation

A photocatalyst is a catalyst that accelerates a photoreaction, the  process  is known  as photocatalytic oxidation. When  a photocatalyst is exposed to UV light in the presence  of water vapor, two highly reactive substances are formed: hydroxyl radicals  [-OH] and  a  superoxide  anion  [O2-].  It allows the oxidation  of airborne  VOCs  and  toxic organic  matter  into carbon dioxide and water at room temperature with UV. The photocatalyst  used  in the  APCO is titanium  dioxide,  which has a strong photo  catalyst reaction.

Titanium dioxide, also known as titania, is the naturally occurring oxide of titanium, chemical formula TiO2. Approved by the Food and Drug Administration (FDA), Titanium Dioxide is considered  a safe substance and harmless to humans. It is
Photocatalytic oxidation using titanium dioxide irradiated with UV-C light

Hydroxyl radicals are among  the strongest oxidizing species, in fact, much  stronger  than  chlorine, ozone, and  peroxide. They  have  also  proven   to  be  very  powerful  disinfecting agents.

For deodorizing applications, hydroxyl radicals accelerate the breakdown  of many Volatile Organic Compounds  (VOCs); destroying  their molecular bonds  by combining  the organic gases to form a single molecule that is not harmful to humans.
Some of the  examples  of odor  molecules  are: formaldehyde, toluene, fecal odors, gasoline, and  many other  hydrocarbon molecules in the indoor environment.

As an anti-microbial, titanium  dioxide has strong  oxidation affects on microorganisms  including all bacteria  and fungi. The exceptional  oxidizing power  of Titanium  Dioxide destroys  bacterial  membrane cells, causing  leakage  of the  cytoplasm, which inhibits bacteria’s activity and ultimately results in death  and decomposition of the microorganisms. Disinfections by photocatalytic oxidation is approximately three times stronger  than chlorination, and 1.5 times stronger  than ozonation.