A vacuum-ultraviolet/ultraviolet (VUV/UV) mercury lamp was found to be a highly efficient radiation source for UV-based advanced oxidation processes (AOPs). If this lamp could enhance the UV/H 2 O 2 process, it would be very attractive. Hence, we have investigated sulfamethazine (SMN) degradation by the VUV/UV/H 2 O 2 process based on a bench-scale mini-fluidic VUV/UV photoreaction system (MVPS), a pilot reactor, and a model analysis. At high [SMN] 0 in the MVPS, the apparent SMN degradation rate constant ( k ′ app ) increased with increasing H 2 O 2 dose, while at low [SMN] 0, k ′ app decreased with increasing H 2 O 2 dose; this behavior was unexpected. Meanwhile, at low [SMN] 0 in a pilot reactor, H 2 O 2 induced just a slight enhancement in the VUV/UV/H 2 O process. A numerical simulation of the process suggested that for an integrated AOP (i.e., VUV/UV/H 2 O 2 ) consisting of various component AOPs, H 2 O 2 could inhibit the component AOPs with HO* that did not originate from H 2 O 2 (e.g., VUV photolysis of water). The apparent H 2 O 2 role in the integrated AOPs was dependent on the contribution comparison between component AOPs that involved HO* that did or did not originate from H 2 O 2 . These results revealed important information regarding the application of the VUV/UV/H 2 O 2 process in water treatment.
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Li et al. (2018) studied this question.
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