Аннотация
This work aimed at investigating the photocatalytic treatment of a synthetic wastewater using UV light (254 nm, 6 W), TiO 2 catalyst and H2O2 in a batch recycle annular photoreactor. The total volume of the solution was 250 mL while the irradiated volume in the annular photoreactor with 55.8 mL. Each experiment lasted 120 min and samples were sent for Total Carbon and HPLC analysis. The stock wastewater had initial total carbon 1118 mg L -1 . The effect of the presence of phenol in the wastewater on total carbon (TC) removal was also studied. It was shown that the photocatalytic treatment was effective only when initial TC was decreased to 32 mg L -1 , whereas the optimum TiO 2 concentration was 0.5 g L -1 , leading to a TC removal up to 56%. For the same initial carbon load, the optimum H 2 O 2 concentration was found to be 67 mg L -1 resulting in 55% TC removal. Combining, however, TiO 2 and H 2 O 2 did not lead to better performance, as 51% TC removal was observed. In contrast, when initial carbon in the wastewater was partially substituted by phenol, the combination of catalyst and hydrogen peroxide was beneficial. Specifically, when 10 ppm of phenol were added keeping the same initial TC concentration, UV/TiO 2 treatment resulted in 46% TC removal and 98% phenol conversion, whereas using additionally H 2 O 2 led to 100% phenol conversion after 45 minutes and 81% TC removal.