Comparison of Different UV-activated AOP Methods
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Morten E. Simonsen
,
Carina V. Jensen
Abstract
In this study the photonic efficiency of different UV activated AOP methods are compared in regard to the oxidation of the dye p-nitrosodimethylaniline (RNO). The UV activated methods include heterogeneous photocatalysis (TiO2/UV), UV activated persulfate (UV/S2O82-) and hydrogen peroxide (UV/H2O2), vacuum UV irradiation (VUV) and combination of these. The photonic efficiencies were determined both by measuring the bleaching of RNO by UV/VIS and by measuring the decomposition by TOC. The results of this investigation showed that the highest photonic efficiency was observed for the system consisting of VUV/H2O2 (3.06%). Similar photonic efficiencies were observed for the UV/H2O2, UV /TiO2 (suspension), and UV/S2O82- process. These numbers suggest that only around 3% of the emitted photons are used in the bleaching of RNO. The photonic efficiency for the mineralization of RNO for the UV/H2O2 process was determined to around 20%. No synergistic effect was observed when combining photocatalysis with H2O2, S2O82- or VUV irradiation. In all the latter cases it was found that the bleaching rates for these techniques alone were higher than those observed combined with photocatalysis. The only process showing synergistic effects was the system consisting of VUV/H2O2.
© 2016 by Walter de Gruyter Berlin/Boston
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