Photocatalytic oxidation and catalytic wet air oxidation of real pharmaceutical wastewater in the presence of Fe and LaFeO3 doped activated carbon catalysts
Makaleler > Tam Makale · 2021
Yazarlar: Ozlem Berkun Olgun, Burcu PALAS, SÜHEYDA ATALAY, Gülin ERSÖZ
Chemical Engineering Research and Design, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2021, cilt 171, ss 421-432
DOI: 10.1016/j.cherd.2021.05.017
Özet
Real pharmaceutical wastewater was treated by photocatalytic oxidation and catalytic wetair oxidation (CWAO) processes. The catalytic performance of Fe/AC and LaFeO3/AC (AC: Commercial activated carbon) was compared in the advanced oxidation processes. The influences of the reaction parameters were determined by using Box-Behnken design. Fe/AC catalyst was more effective in both of the photocatalytic oxidation and catalytic wet air oxidation processes. In the photocatalytic oxidation process, 72.7% COD removal was achieved at pH = 4.5, 2.0 g/L, and [H2O2](o)=0.32 mM. Under the optimum conditions of the CWAO, which were determined as 3 g/L of catalyst loading, pH = 3, and 50 degrees C, 83.1% COD removal efficiency was obtained. CWAO method was determined as more suitable since a higher COD removal efficiency was achieved in a shorter reaction time. The toxicity in terms of L. sativum growth inhibition was evaluated as 4.82% after the CWAO treatment. A two-step first-order reaction kinetics provided the best fit of the CWAO experimental data. The activation energies of the fast and the slow steps were 25,661.16 and 28,327.46 J/mole, respectively. (C) 2021 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.