Solar Photocatalytic Detoxification and Disinfection of Water: Recent Overview

[+] Author and Article Information
Julián Blanco-Galvez, Pilar Fernández-Ibáñez

 Plataforma Solar de Almería (CIEMAT), Carretera Senés, km 4, 04200 Tabernas, Almería, Spain

Sixto Malato-Rodríguez

 Plataforma Solar de Almería (CIEMAT), Carretera Senés, km 4, 04200 Tabernas, Almería, Spainsixto.malato@psa.es

J. Sol. Energy Eng 129(1), 4-15 (Mar 28, 2006) (12 pages) doi:10.1115/1.2390948 History: Received January 04, 2006; Revised March 28, 2006

During the last few years, there has been a plethora of research and development in the area of solar photocatalysis (TiO2 and photo-Fenton). This overview, of the most recent papers on the use of sunlight to produce the OH, comments on those most relevant to the development of the technology and summarizes most of the recent research related to the degradation of water contaminants, and how solar photocatalysis (coupled with biotreatment) could significantly contribute to the treatment of very persistent toxic compounds. Various solar reactors for photocatalytic water treatment based mainly on nonconcentrating collectors developed during the last few years are also described in detail. This review also reports the use of the photocatalytic processes (TiO2) to inactivate microorganisms present in water, placing special emphasis on those applications that make use of sunlight. Work on water disinfection mechanisms in the last decade is summarized in the last part of this overview, with attention to some experimental systems developed to optimize this disinfection technology.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Degradation of a model contaminant (2-amino-2-phenyl-propionic acid, C0=500mg∕L) dissolved in water by photo-Fenton at Fe=20mg∕L

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Figure 2

View of the solar collectors (100m2) installed at HIDROCEN (Madrid, Spain)

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Figure 3

Solar detoxification demonstration plant erected by ALBAIDA at La Mojonera (Almería, Spain). (a) 150m2 of solar collectors (CPCs), total volume 1060L; (b): H2O2(33%w∕v) tank; (c) recirculation tank; (d) treated water to washing process; (e) wastewater for washing process; and (f) UVA measuring and recording; (1, 2, 3, 4): automatic electrical valves for filling, emptying, recirculating and venting, respectively; (4, 5): pumps for emptying and recirculating, respectively

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Figure 4

Schematic illustration of the solar photocatalytic process for bacteria inactivation in the presence of an aqueous suspension of TiO2 (relative size of each element is schematically represented at the bottom)



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