Internal fouling during microfiltration with foulants of different surface charges

Trinh，Thien An1,2; Li，Weiyi1,3; Chew，Jia Wei1,2

2020-05-01

10.1016/j.memsci.2020.117983

JOURNAL OF MEMBRANE SCIENCE   影响因子和分区

0376-7388

1873-3123

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.

Colloidal foulant Internal fouling model Membrane fouling Optical coherence tomography Surface charge

EI ; SCI

英语

其他

Ministry of Education - Singapore[2019-T1-002-065] ; GlaxoSmithKline[] ; GlaxoSmithKline Australia[]

Engineering ; Polymer Science

Engineering, Chemical ; Polymer Science

WOS:000522854300017

Elsevier B.V.

20200808207979

Membrane fouling ; Membranes ; Optical tomography ; Pore size ; Surface charge ; Tomography

Optical Devices and Systems:741.3 ; Imaging Techniques:746 ; Chemical Operations:802.3 ; Materials Science:951

CHEMISTRY

2-s2.0-85079626140

Scopus

1.School of Chemical and Biomedical Engineering,Nanyang Technological University,Singapore
2.Singapore Membrane Technology Centre,Nanyang Environment and Water Research Institute,Nanyang Technological University,Singapore
3.School of Environmental Science & Engineering,Southern University of Science and Technology,Shenzhen,China

Trinh，Thien An,Li，Weiyi,Chew，Jia Wei. Internal fouling during microfiltration with foulants of different surface charges[J]. JOURNAL OF MEMBRANE SCIENCE,2020,602.

Trinh，Thien An,Li，Weiyi,&Chew，Jia Wei.(2020).Internal fouling during microfiltration with foulants of different surface charges.JOURNAL OF MEMBRANE SCIENCE,602.

Trinh，Thien An,et al."Internal fouling during microfiltration with foulants of different surface charges".JOURNAL OF MEMBRANE SCIENCE 602(2020).