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Dosages for a 90% kill rate of most bacteria and viruses range between 2,000 and 8,000 μJ/cm 2. Larger parasites such as Cryptosporidium require a lower dose for inactivation. As a result, US EPA has accepted UV disinfection as a method for drinking water plants to obtain Cryptosporidium , Giardia or virus inactivation credits.
Oxygen can be supplied to the biofilm, either concurrently or countercurrently with water flow. Aeration occurs passively by the natural flow of air through the process (three phase biofilter) or by forced air supplied by blowers. Microorganisms' activity is a key-factor of the process performance.
“Indoor air can be more polluted than outdoor air, depending on where you live, what kind of materials your home was made from, how you cook your food, how you clean, etc.,” says Sarah ...
Since the release of the initial 1989 study, titled A study of interior landscape plants for indoor air pollution abatement: An Interim Report, [6] further research has been done including a 1993 paper [7] and 1996 book [8] by B. C. Wolverton, the primary researcher on the original NASA study, that listed additional plants and focused on the removal of specific chemicals.
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Unlike air purifiers, which filter or otherwise trap particles within an air circulator, air sanitizers act on airborne microorganisms in open interior air space. A sneeze - or cough -generated pathogenic aerosol will take significant time to be treated by a circulating air purifier simply because air circulators are unable to treat all air in ...
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