%0 Journal Article
%T Comparison among some advanced oxidation processes in the degradation kinetics of the crude tannery effluent
%A Camila Lopes Maler
%A Keiko Takashima
%J Semina : Ci¨şncias Exatas e Tecnol¨®gicas
%D 2011
%I State University of Londrina
%X In this work it was investigated the degradation kinetics of the crude tannery wastewater, collected in the homogenized reservoir with a chemical oxygen demand of 3340 mg L-1 at pH 8.1, through the advanced oxidation processes as photocatalysis mediated by semiconductor, photolysis in presence of hydrogen peroxide and photo-Fenton process at 30 oC. The experiments were performed using a 1:50 proportion in distilled water inside the double wall cylindrical reactor opened to the atmospheric air by varying the oxidant concentration. The degradation rate constants, kobs, determined under pseudo-first order conditions in pH ca. 7.3 and 30 oC, were higher for the photocatalytic process mediated by ZnO (kobs= 1.23x10-1 to 2.74x10-1 min-1) followed by TiO2 (0.90x10-2 min-1 to 3.35x10-2 min-1). As to for the rate constants under photolysis in presence of H2O2 (9.36x10-3 to 7.44x10-3 min-1) at pH ca. 6.8 as well as in photo-Fenton (7.30x10-3 to 12.0x10-3 min-1) at pH 5.8 was significantly lower than photocatalysis at 30ˇăC. The chemical oxygen demand of the wastewater was completely removed after 2 h on photocatalytic process at 30 ˇăC.
%K Tannery wastewater
%K Photocatalysis
%K TiO2
%K ZnO
%U http://www.uel.br/revistas/uel/index.php/semexatas/article/view/8045