Aplicação do processo Fenton-like em sistema batelada e em fluxo contínuo na degradação de efluente têxtil

• Autor(a) principal: Martins, Thyara Campos
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do UNIOESTE
• Texto Completo: http://tede.unioeste.br:8080/tede/handle/tede/1842
• topic: Efluente têxtil; Tratamento de efluentes; Processo Fenton-like; Planejamento experimental; Textile effluent; Treatment of effluent; Fenton-like process; Experimental design; CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA::PROCESSOS INDUSTRIAIS DE ENGENHARIA QUIMICA

The objective of this study is to evaluate the performance of Fenton-like process using steel wool trade as a source of metallic iron and ferrous ions in the treatment of textile effluent. Preliminary experiments were conducted to evaluate the efficiency of the Fenton-like degradation and mineralization of organic and inorganic pollutants. The experiments were conducted in laboratory scale reactors. The operational parameters of the reactor: H2O2 molar concentration of reactants and Fe0 were optimized based on the values of total organic carbon (TOC), chemical oxygen demand (COD), turbidity and discoloration from an experimental design Delineation Central Composite Rotational (DCCR) 22 quadruplicate with the center point and another 4 axial points. Obtained good representation of the experimental data verified by analysis of variance. The efficiency of the processes used in the treatment of textile effluent was evaluated based on the parameters: decreased levels of TOC, COD, color and turbidity, as well as analysis of the behavior of the concentrations of sulfate, nitrate, hydrogen peroxide, dissolved iron, ammonia and organic nitrogen and reduced absorbance in the lengths where 320 and 600 nm. The molar ratio of the highest efficiency for conventional Fenton process was 1:0,9:27,5 to their COT:Fe2+:H2O2. Under these conditions, the process decreased by 91.06% of the TOC parameter, whereas the COD was reduced by 94.51%, 99.02% of discoloration and 99.88% of reduced turbidity. The Fenton-like process showed greater reductions of the parameters studied when subjected to 1:1,7:27,5 molar ratio of the respective TOC:Fe0:H2O2; these conditions the process showed 92.88% reduction of TOC, 93.91% reduction of COD, 98.11% of discoloration and 98.87% reducing turbidity. Both procedures showed these results to a reaction time of 720 minutes. Using the continuous flow system for the FL and FC process, the system allowed an efficient degradation of the effluent at retention times of about 720 minutes. The processes presented similar efficiencies, which demonstrates that the Fenton-like process is an effective alternative for the treatment of textile effluents. Confirming the ability of steel wool as the source of metallic iron, capable of use in oxidation processes of degradation.