Estudo experimental da microfiltração tangencial com membrana cerâmica aplicada na clarificação da vinhaça / Experimental study of cross flow microfiltration with ceramic membrane applied in clarifying the vinasse

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

This present work studied the process of cross flow microfiltration using tubular ceramic applied in the vinasse clarification from sugar cane, analyzing fluid dynamic features of process and the types of pore blocking applied to math models. In this research was used alfa-alumina (alfa-AL IND.2O IND. 3) ceramic membrane with pore size of 1.2 müm and 0.8 müm, respectively called M12 and M08. Permeate samples (transmembrane flux) and retentate were analyzed measuring their specific mass, pH, electrical conductivity, viscosity, surface tension, total soluble solid (ºBrix), color and turbidity. The virgin membranes were analyzed first with tap water in different fluid dynamics conditions and transmembrane flux was measured in function of the time to quantify its proprieties before to have impregnation in its surface. Vinasse was deluded in water in the proportion of 50% vol and it was microfiltered in varied fluid dynamics using transmembrane pressure of 200 kPa, 300 kPa, 400 kPa and 500 kPa in turbulent flow with Reynolds number 11,500; 22,500 and 33,500. The experimental data obtained were analyzed through to graphics of transmembrane flux versus time and resistances (membrane resistance, total resistance, polarization resistance and fouling resistance) versus pressure, and produced tables with physical-chemical proprieties values. The influence of interaction between vinasse and membrane surface was investigated using math models to pore blockage. The high performance was obtained with M12 membrane with permeate of 31.48 L/h.M POT.2in transmembrane pressure of 500 kPa (Re = 13,500). For M08 membrane permeate flux (39.47 L/h.M POT.2) was higher for the situation of greater tangential velocity (Re = 33,500) and higher pressure (deltaP = 500 kPa). The analysis for the pore blockage showed that the permeate flux decreases primarily by phenomena related to the cake formation of polarization and partial blockage of pores. Analyses of pH and viscosity of permeate flux showed that Reynolds number influences on values. The study showed that the clarification of vinasse by ceramic membranes of microfiltration has the potential to remove suspension particles and to reduce turbidity and color.

ASSUNTO(S)

modelo de bloqueio microfiltração microfiltration sugar cane vinasse vinhaça blocking law cana de açúcar ceramic membrane membrana cerâmica

ACESSO AO ARTIGO

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