A review on photocatalytic ozonation used for the treatment of water and wastewater

•Photocatalytic ozonation is a powerful oxidation process for water/wastewater treatment.•Synergistic effects are observed by combining various photocatalysts with ozone.•Photocatalytic ozonation is often more cost-effective than ozonation and photocatalysis.•Photocatalytic ozonation can moderate th...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2015-03, Vol.263, p.209-219
Main Authors: Mehrjouei, Mohammad, Müller, Siegfried, Möller, Detlev
Format: Article
Language:English
Subjects:
Advanced oxidation processes
Chemical engineering
Economics
Hydroxyl radicals
Ozone
Photocatalysis
Photocatalytic ozonation
Pollutants
Waste water
Wastewater treatment
Water and wastewater treatment
Wavelengths
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Summary:•Photocatalytic ozonation is a powerful oxidation process for water/wastewater treatment.•Synergistic effects are observed by combining various photocatalysts with ozone.•Photocatalytic ozonation is often more cost-effective than ozonation and photocatalysis.•Photocatalytic ozonation can moderate the poor mass transfer of fixed catalysts.•Changing the operational conditions can significantly affect the oxidation efficiency. The present study aims to describe photocatalytic ozonation as a combination of two different techniques for hydroxyl radical generation; photocatalysis and ozonation, and to highlight its advantages for water and wastewater treatment compared to these two technologies. An extensive review on the mechanisms, kinetics and economic aspects of photocatalytic ozonation has been performed to explore the synergistic effects produced by applying this oxidation method to the degradation, mineralisation and detoxification of different organic pollutants in aqueous media. The influence of experimental parameters such as pollutant concentrations, ozone dose, photocatalytic load and properties, solution pH and temperature, irradiation wavelength and intensity and the effect of the presence of some substances on the efficiency of photocatalytic ozonation is discussed. Finally, plasma-induced photocatalytic systems are introduced as a new approach for handling photocatalytic ozonation treatments.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2014.10.112