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Chapter 7

Devices for Water and Air Purification

The first part of this Chapter describes the photocatalytic processes and photoreactors developed for water purification at industrial or pilot plant level. The first European industrial detoxification plant, based on compound parabolic solar collectors, treats pesticides contained in water in a batch photoreactor by coupling photocatalysis and photo Fenton methods. In order to degrade free cyanide ions contained in power plant waste water, a continuously stirred tank photoreactor at pilot plant level was designed, constructed and tested. The Chemical Reactor Engineering Centre of the University of Western Ontario (Canada) designed and constructed photocatalytic reactors (either for gas-solid or liquid-solid regime) under the optimality criteria of improved efficiency and improved irradiation of the photocatalyst. UBE Group (Japan) has successfully developed a photocatalytic fiber which contains titania photocatalyst so that it is able of oxidizing and decomposing organic substances.

The photocatalytic method has attracted the attention of industry devoted to produce apparatuses for air conditioning, being in this case the objective that of purifying the indoor air of homes, hospitals, farms, etc. In some purifying apparatuses the photocatalytic method is coupled with the generation of negative or positive air ions. The second part of the Chapter describes some of commercial apparatuses, both photocatalytic and photocatalytic/ionizer.

Print publication date: 24 Aug 2010
Copyright year: 2011
Print ISBN: 978-1-84755-870-1
PDF eISBN: 978-1-84973-203-1