Features of ultrafiltration purification of industrial solutions of starch and treacle production

Abstract

The paper examines the specific output stream and the rate of detention of a semi-permeable ultrafiltration membranes, UPM, UAM150, UAM200 in the separation process, waste starch and syrup production JSC., the company "Krakhmaloprodukt" low-pressure baromembrane method. As a result of the analysis of experimental data, the dependence of the retention factor of ultrafiltration membranes UPM-K, UAM150, UAM20 at different concentrations of the dissolved substance was obtained and analyzed. For the theoretical calculation of the process of ultrafiltration separation technology solutions of starch and syrup production modified mathematical expression for the factor of detention and the specific output stream and the numerical values of the empirical coefficients. Ultrafiltration for the separation of waste starch and syrup production the technological scheme of purification, separating the main elements of which was the pre-filter, biofilter, cascade ultrafiltration apparatus, centrifugal and plunger pumps, as well as the adsorption column.The application expediency of the selected apparatus with flat chambers lies in the simplicity of their production technology and in the self-selection possibility of optimum type membranes. It is possible in the presented apparatuses to usemembranes of different types and in the course of the evaluation experiment to establish to what extent they correspond to the most important technological parameters of the process, such as specific output flow, retention factor and resistance to pollution. It is noted that the specific output flow of ultrafiltration membranes decreases with the increase of the initial concentration of the dissolved substance, as the viscosity of the solution increases and its osmotic pressure increases, and the decrease in the retention factor of ultrafiltration membranes is caused by the formation of diffusion boundary layers on the active layer of membranes.