EXPERIMENTAL-DATA AND BEHAVIOR OF STARCH WATER SOLUTIONS WITH AN ULTRAFILTRATION MODULE/

A crossflow, plane membrane, ultrafiltration module is presented in th is paper. The experimental data obtained for different concentrations of the starch/water system after modifying the transmembrane pressure and the feed inlet velocity are given. A series resistances model was applied to the experimental data in order to obtain analytically the c ontributions of the fouling and gel resistances. In addition, the expe rimental data were correlated to a diffusion model. By considering the phenomenon of concentration-polarization, this allowed us to evaluate the concentration of the gel layer to each composition of the feed fl ow and the mass transfer coefficients, as well as their relation with the feed inlet velocity. The density and viscosity of various solution s of the starch/water system were determined. This enabled us to evalu ate the diffusion coefficient after using the Grober and Chilton-Colbu rn equations.