Understanding the fouling/scaling resistance of superhydrophobic/omniphobic membranes in membrane distillation

Liu, L., Xiao, Z., Liu, Y., Li, X., Yin, H. , Volkov, A. and He, T. (2021) Understanding the fouling/scaling resistance of superhydrophobic/omniphobic membranes in membrane distillation. Desalination, 499, 114864. (doi: 10.1016/j.desal.2020.114864)

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Abstract

Membrane distillation has shown great promises in desalinating various water streams. Significant progresses have been made in the past decades owing to the development of advanced membrane materials, such as superhydrophobic and omniphobic membranes. However, fouling and scaling remains a critical issue for stable operation. This account summarizes contemporary theories in fouling and scaling formation and their limitations in explaining the fouling resistance of superhydrophobic and omniphobic membranes. A new understanding is proposed based on hydrodynamics where non-slip boundary conditions play a critical role. By distinguishing a pinned and suspended wetting state, it is suggested that a superhydrophobic or omniphobic membrane correlates to a suspended wetting state, consequently a slip surface leading to scaling/fouling resistance. A new framework for analyzing the fouling/scaling behavior of MD membrane is provided to identify the wetting and hydrodynamic character of the membrane. A novel concept of treating the highly saline waste streams is suggested to cover membrane synthesis, module design and process optimization. The present work will be of interest to scientists and engineers searching for solutions to the MD fouling issues.

Item Type:Articles
Additional Information:The research was partially supported by National Natural Science Foundation of China (Nos. 21978315, 52011530031), Royal Society Newton Advanced Fellowship (No. NA170113) and CAS International Collaboration (No. GJHZ2080). We also thank the frame work research consortium for partial financial support (RFBR No. 18-58-80031, NSFC No. 51861145313, DST IPN/7864, NRT No. 116020, CNPq/BRICS STI-2-442229/2017-8).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Yin, Professor Huabing
Authors: Liu, L., Xiao, Z., Liu, Y., Li, X., Yin, H., Volkov, A., and He, T.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Desalination
Publisher:Elsevier
ISSN:0011-9164
ISSN (Online):1873-4464
Published Online:23 November 2020
Copyright Holders:Copyright © 2020 Elsevier B.V.
First Published:First published in Desalination 499:114864
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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