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Title: Novel sandwich-structured hollow fiber membrane for high-efficiency membrane distillation and scale-up for pilot validation
Authors: Qua, Marn Soon
Zhao, Yan
Zhang, Junyou
Hernandez, Sebastian
Paing, Aung Thet
Mottaiyan, Karikalan
Zuo, Jian
Dhalla, Adil
Chung, Tai-Shung
Gudipati, Chakravarthy
Keywords: Engineering::Environmental engineering::Water treatment
Issue Date: 2022
Source: Qua, M. S., Zhao, Y., Zhang, J., Hernandez, S., Paing, A. T., Mottaiyan, K., Zuo, J., Dhalla, A., Chung, T. & Gudipati, C. (2022). Novel sandwich-structured hollow fiber membrane for high-efficiency membrane distillation and scale-up for pilot validation. Membranes, 12(4), 423-.
Project: S15-1068-NRF EWI-RCFS 
Journal: Membranes 
Abstract: Hollow fiber membranes were produced from a commercial polyvinylidene fluoride (PVDF) polymer, Kynar HSV 900, with a unique sandwich structure consisting of two sponge-like layers connected to the outer and inner skin layers while the middle layer comprises macrovoids. The sponge-like layer allows the membrane to have good mechanical strength even at low skin thickness and favors water vapor transportation during vacuum membrane distillation (VMD). The middle layer with macrovoids helps to significantly reduce the trans-membrane resistance during water vapor transportation from the feed side to the permeate side. Together, these novel structural characteristics are expected to render the PVDF hollow fiber membranes more efficient in terms of vapor flux as well as mechanical integrity. Using the chemistry and process conditions adopted from previous work, we were able to scale up the membrane fabrication from a laboratory scale of 1.5 kg to a manufacturing scale of 50 kg with consistent membrane performance. The produced PVDF membrane, with a liquid entry pressure (LEPw) of >3 bar and a pure water flux of >30 L/m2·hr (LMH) under VMD conditions at 70-80 °C, is perfectly suitable for next-generation high-efficiency membranes for desalination and industrial wastewater applications. The technology translation efforts, including membrane and module scale-up as well as the preliminary pilot-scale validation study, are discussed in detail in this paper.
ISSN: 2077-0375
DOI: 10.3390/membranes12040423
Organisations: Nanyang Technological University–NTUitive Pte Ltd
Research Centres: Nanyang Environment and Water Research Institute 
Separation Technologies Applied Research and Translation Centre
Rights: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:NEWRI Journal Articles

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