Abstract
In this study, five ultrafiltration membranes (polysulfone, cellulose acetate and polyethe-rsulfone) were tested in the treatment of aqueous protein solutions similar to wastewater from fermentation industries. The experiments were made in tangential flow filtration. The permeate flux for the five membranes tested at the optimum pressure of 3 bar decreased due to the effect of clogging the pores by the macromolecular protein solutions. Cellulose acetate membranes showed the lowest permeate flux (Ac-Cel1=152.4 L/m2.h and Ac-Cel2=40.3 L/m2.h) which doesn�t recommend them for the ultrafiltration process of bovine serum albumin. When a polysulfone membrane was used in several cycles of protein-containing wastewater ultrafiltration, the permeate flow decreased progressively from one cycle to another due to the internal clogging of the membrane (501.6 L/m2.h up to 444.0 L/m2.h). Regarding the ultrafiltration of protein solutions with a suspended yeast content, the clogging was predominant on the membrane�s surface, which results in a decrease of the permeate flux by over 50%.
Highlights
IntroductionMembrane techniques include a group of separation processes in which the characteristics of a membrane (electric charge, porosity, selectivity) are used to separate the components of a liquid and gas feed streams according to size
Membrane techniques include a group of separation processes in which the characteristics of a membrane are used to separate the components of a liquid and gas feed streams according to size
Ultrafiltration process techniques was employed to removal protein and yeast from synthetic solutions
Summary
Membrane techniques include a group of separation processes in which the characteristics of a membrane (electric charge, porosity, selectivity) are used to separate the components of a liquid and gas feed streams according to size. In these membrane processes, the feed stream is separated into two: the fraction that permeates through the membrane (permeate), and the fraction containing the components that have not been transported through the membrane (concentrate) [1]. Ultrafiltration is the most important process in membrane technology and has the ability to remove colloids and different macromolecules with a molecular weight ranging from 1000 to 100000 Da [1217]. Ultrafiltration presents a series of advantages, like low energetic consumption, low operating temperature, and the absence of phase transition [18]
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