Akademik Veri Yönetim Sistemi
JOURNAL OF ADVANCED OXIDATION TECHNOLOGIES, cilt.13, sa.2, ss.206-211, 2010 (SCI-Expanded)
The degradability of an azo dye (C.I. Acid Black 2), synthetic and real dyebaths, and actual textile dyeing waste-water were investigated using a homogeneous and heterogeneous Advanced Oxidation Processes (AOPs) in combination with power ultrasound (US). The components of the homogeneous process were US, short wave UV-C and ferrous ions, and those of the heterogeneous were US, short wave UV-C, ZnO and H2O2. It was found that decolorization of all solutions followed a kinetic pattern similar to that of pseudo-first order profile with, however, stabilization of the visible absorbance at a non-zero plateau. The estimated color decay rate constants of the dye and the synthetic dyebath in homogeneous and heterogeneous processes were 0.479 min(-1), 8.52 min(-1) and 0.0799 min(-1), 0.0193 min(-1), respectively. More rapid degradation of the dye solution than the dyebath in heterogenous processes is a consequence of the presence of auxiliary chemicals in the latter that may scavenge OH radicals and absorb UV light. It was also found that real dyebath solutions were more recalcitrant than dyeing wastewater due to the intense color of the former. The COD removal efficiencies of the dyebath and wastewater were 1-3% and 40%, respectively after 2 h treatment with US/UV/Fe2+ homogeneous hybrid process. The heterogeneous hybrid process US/UV/ZnO/H2O2 provided 10-12% COD elimination in both the dyebath and the wastewater within the same time period.