Pretreatment with ceramic membrane microfiltration in the clarification process of sugarcane juice by ultrafiltration

Resumo

In the present study, the sugar cane juice from COCAFE Mill, was clarified using tubular ceramic membranes (α-Al₂O₃/TiO₂) with pore size of 0.1 and 0.3 µm, and membrane area of 0.005 m^2. Experiments were performed in batch with sugar cane juice, in a pilot unit of micro and ultrafiltration using the principle of tangential filtration. The sugar cane juice was settled for one hour and the supernatant was treated by microfiltration. After that, the MF permeate was ultrafiltered. The experiments of micro and ultrafiltration were carried out at 65ºC and 1 bar. The ceramic membranes were able to remove the colloidal particles, producing a limpid permeated juice with color reduction. The clarification process with micro- followed by ultrafiltration produced a good result with an average purity rise of 2.74 units, 99.4% lower turbidity and 44.8% lighter color in the permeate.