Naslov
Statistical evaluation of UV/TiO2/H2O2 and Fe2+/H2O2 process for the treatment of coloured wastewater : a comparative study

Autori
Grčić, Ivana ; Vujević, Dinko ; Koprivanac, Natalija

Izvornik
Chemical and biochemical engeenering quartely (0352-9568) 24 (2010), 4; 387-400

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
wastewater treatment; reactive azo dyes; photocatalytic oxidation; Fenton oxidation; pesponse surface method (RSM); D-optimal design

Sažetak
In this work two types of advanced oxidation processes ; photocatalytic oxidation, UV/TiO2/H2O2 and classic Fenton oxidation, Fe2+/H2O2, have been applied for the treatment of a model wastewater containing reactive azo dyes, C.I. Reactive Violet 2 (RV2) and C.I. Reactive Yellow 3 (RY3). In order to evaluate the effect of the initial concentration of catalysts, mass.conc.(TiO2) or [Fe2+], initial concentration of oxidant, [H2O2] or the initial oxidant/catalyst molar ratio [H2O2]/[Fe2+] and pH on apparent mineralization and decolourization rates, a response surface method (RSM) D-optimal design was used. Mineralization was described by pseudo-first-order kinetics with the highest observed rate constants ; km, UV = 0.0065 min-1 in the case of UV/TiO2/H2O2 process and km, F = 0.0213 min-1 in the case of Fenton process. A kinetic model describing decolourization on wavelengths of maximum absorbance for studied dyes, lambdamaxRV2 550 nm, and lambdamaxRY3 385 nm, was composed of two first-order in-series reactions with corresponding decolourization rates. The effects of each factor on the efficiency of the applied processes were found to be significant.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

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