Please use this identifier to cite or link to this item:
Title: Internal fouling during microfiltration with foulants of different surface charges
Authors: Trinh, Thien An
Li, Weiyi
Chew, Jia Wei
Keywords: Engineering::Bioengineering
Issue Date: 2020
Source: Trinh, T. A., Li, W. & Chew, J. W. (2020). Internal fouling during microfiltration with foulants of different surface charges. Journal of Membrane Science, 602, 117983-.
Project: 2019-T1-002-065
Journal: Journal of Membrane Science
Abstract: In view of the inevitability of membrane fouling, it is critically important to understand the underlying mechanisms to alleviate fouling and thereby improve the feasibility of membrane-filtration for more applications. This study was targeted at understanding the internal membrane fouling mechanisms by three types of polystyrene (PS) particles (sized at ~ 0.45 μm; different surface charges) during microfiltration with the same polycarbonate track-etched (PCTE) membrane (nominal pore size of 2 μm). Optical coherence tomography (OCT) technique, which was employed to monitor membrane fouling, indicated greater extents of particle deposition in the case of the positive and less negative PS particles, which is consistent with the more severe flux declines relative to the more negative PS particles. The new fouling model developed that additionally accounts for internal cake filtration, on top of the well-reported pore constriction and pore blockage, revealed the fouling mechanisms at play. For the positive PS particles, the attractive particle-membrane interaction led to a more homogeneous layer-by-layer cake growth, which resulted in denser packing in the pore and higher internal cake resistance, and thereby the worst flux decline. In contrast, for the negative PS particles, the repulsive particle-particle and particle-membrane interactions resulted in more random deposition of the particles inside the pores, resulting in more extensive pore constriction and blockage, as well as lower resistance of the internal cake. This study underscored the importance of surface charge in internal fouling and provided insights on the lesser reported internal fouling mechanisms.
ISSN: 0376-7388
DOI: 10.1016/j.memsci.2020.117983
Rights: © 2020 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:NEWRI Journal Articles
SCBE Journal Articles

Citations 20

Updated on Dec 3, 2022

Web of ScienceTM
Citations 20

Updated on Dec 2, 2022

Page view(s)

Updated on Dec 5, 2022

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.