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Three Advanced Oxidation Technologies (UV/H 2 O 2 , UV/TiO 2  and Electron Beam) have been evaluated using the Electrical Energy per Order (EE/O) figure-of-merit. These processes have been tested on two aqueous treatment systems: the bleaching of methylene blue and the decay of phenol. In general, as expected, for a given process, the EE/O increased as the concentration of the contaminant increased. However, when the three processes were compared for the same system at the same concentration, the EE/Os for the UV/H 2 O 2  and Electron Beam processes were very similar, but the EE/O for the UV/TiO 2  was much higher than that for the other two processes. The UV/H 2 O 2  process has the disadvantage that there is an added cost of chemicals (principally H 2 O 2 ) and the E-beam process has the disadvantage that there is a constant power required to run the apparatus even when the beam is off. Nevertheless, the UV/TiO 2  system has an inferior performance relative to the other two processes; the principal reason is probably the low quantum yield (~0.04-0.08) for the generation of hydroxyl radicals on the surface of TiO 2  particles.

Figures-of-Merit for Advanced Oxidation Technologies: A Comparison of Homogeneous UV/H 2 O 2 , Heterogeneous UV/TiO 2 and Electron Beam Processes