Abstract
AbstractThis study aimed to optimize two oxidation processes for wastewater reuse of an urban wastewater treatment plant (UWWTP) effluent intended for human consumption. Ozonation and TiO2 photocatalytic oxidation (PCO) processes were compared for their effectiveness in terms of organic matter degradation (measured as UV absorbance at 254 nm, UV254), disinfection by products formation (measured as trihalomethanes formation potential, THMFP), and ecotoxicity (evaluated by Daphnia magna and Lepidium sativum), on secondary treated wastewater collected from a UWWTP in the province of Salerno (southern Italy). Accordingly, ozonation experiments using 28 mg/L ozone dose and PCO experiments using 250 W lamp (emission range: 315–400 nm; emission peak: 14.7 μW/cm2 at 340 nm) and varying TiO2 dose from 1 to 3 g/L were carried out. Ozonation (t1/2 = 71.6 min) was not found as effective as PCO for organic matter degradation at all TiO2 doses, and 3 g/L of TiO2 was found to be the most effective photocatalyst loading ...
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