Influence of membrane structure on fouling layer morphology during apple juice clarification

摘要: The flux behavior of 0.2 μm nylon, polysulfone (PS), polyvinylidene fluoride (PVDF) and polyethersulfone (PES) membranes was examined during dead-end microfiltration commercial apple juice. On nylon membranes, a 0.1 thick surface fouling layer rapidly formed that acted as secondary membrane. colloidal particles retained by this aggregated to form loose gel structure, producing an anisotropic structure. In contrast, the 4 PES slower had more open structure with lower resistance per unit thickness. morphology also did not differ dramatically from subsequently on top PS similar in whereas PVDF closely resembled found PES. density directly correlate membrane hydrophobicity or pure water flux. Atomic force microscopy (AFM) indicated roughness strongly influenced morphology. appears act template for process; therefore, smooth (nylon PS) produce dense same rough (PES PVDF) is much open. Consequently, fluxes are less affected formation.