Morphological analysis of flat and hollow fiber membranes by optical and microscopic methods as a function of the fouling

• Published in: Journal of membrane science 2014-12, Vol.472, p.241-250
• Main Authors: Wyart, Y., Tamime, R., Siozade, L., Baudin, I., Glucina, K., Deumié, C., Moulin, P.
• Format: Article
• Language: English
• Subjects: AFM; Atomic force microscopy; Chemical and Process Engineering; Chemistry; Colloidal state and disperse state; Ear; Engineering Sciences; Exact sciences and technology; Filtration; Fouling; General and physical chemistry; Membranes; Morphological multiscale analysis; Optical fibers; Optics; Organic membrane; Photonic; Scanning electron microscopy; White light interferometry; WLI
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/j.memsci.2014.08.012

In order to provide a better understanding of the impact of flocculant used on membrane properties in drinking water production, a complete structural characterization of membranes was carried out from microscopic to macroscopic scale. New flat-sheet PES membranes with 10, 30 and 100kDa MWCO were characterized by SEM, ellipsometry of angle resolved scattering (EARS), white light interferometry (WLI) and atomic force microscopy (AFM). It was shown that AFM is able to differentiate between membranes according to their MWCO and their manufacturing processes. The impact of flocculant filtration (PAX-XL 7A and Aqualenc F1) on flat-sheet PES 100kDa membrane was studied. SEM and AFM characterizations revealed a modification of membrane surface state after flocculant filtration and cleaning step. AFM was finally used to characterize hollow fiber membranes after 1 and 2 years of water production. The results showed that AFM is a very interesting tool to investigate membrane ageing. •Characterization of flat and hollow fibers at microscopic and macroscopic scales.•Characterization by SEM, AFM, WLI and EARS.•Study of the impact of flocculant filtration on membrane properties.•Characterization of hollow fibers after 1 and 2 years of operation.