PDMS-coated porous PVDF hollow fiber membranes for efficient recovery of dissolved biomethane from anaerobic effluents

This report demonstrates the fabrication of a composite hollow fiber membrane that efficiently recovers dissolved methane (dCH4) from anaerobic wastewater treatment effluents via membrane contactor (MC) process. We first fabricated highly porous hollow fiber membranes (∼85% porosity) using polyvinyl...

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Main Authors: Sethunga, Godakooru Sethunga Mudiyanselage Dilhara Prebhashwari, Karahan, Huseyin Enis, Wang, Rong, Bae, Tae-Hyun
Other Authors: Interdisciplinary Graduate School (IGS)
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/144935
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1449352021-02-10T09:00:53Z PDMS-coated porous PVDF hollow fiber membranes for efficient recovery of dissolved biomethane from anaerobic effluents Sethunga, Godakooru Sethunga Mudiyanselage Dilhara Prebhashwari Karahan, Huseyin Enis Wang, Rong Bae, Tae-Hyun Interdisciplinary Graduate School (IGS) School of Chemical and Biomedical Engineering School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre Science::Chemistry Methane Recovery Hollow Fiber Membrane This report demonstrates the fabrication of a composite hollow fiber membrane that efficiently recovers dissolved methane (dCH4) from anaerobic wastewater treatment effluents via membrane contactor (MC) process. We first fabricated highly porous hollow fiber membranes (∼85% porosity) using polyvinylidene difluoride (PVDF). Then, we coated the whole structure (bulk), or lumen side of PVDF supports with polydimethylsiloxane (PDMS), a hydrophobic polymer possessing high gas permeability. The adjustment of the concentration of PDMS precursor mix could effectively serve for tuning the performance characteristics of MC membranes and helped suppress membrane wetting, a major performance-reducing factor. Despite their denser skin layers, the lumen-modified membranes demonstrated superior dCH4 recovery flux. Mass transfer analyses have confirmed the importance of preserving bulk porosity while coating the membrane surfaces. The long-term performance tests performed using actual anaerobic effluents suggested that the PDMS coating did not accelerate fouling, such that the lumen-modified MC membranes showed an almost steady flux for 8 days with an anaerobic membrane bioreactor effluent. A high-strength effluent, obtained from an up-flow anaerobic sludge blanket reactor, induced faster fouling. However, we observed only a ∼20% flux decline in a 10-day operation. Thus, we propose that the designed PDMS-PVDF composite membranes are promising for industrial practices. National Research Foundation (NRF) Accepted version This study was supported by the research grant provided by the Singapore National Research Foundation under its Environmental & Water Research Program (Project Ref No:1301-IRIS-49) and administered by PUB, Singapore's national water agency. We would like to acknowledge Mr. Chong Yang Chuah for particle size measurements. We also thank the developers of the free ware (or limited freeware) graphic software platforms (Lucidchart, Inkscape, ImageBot) used for the preparation of illustrations in this study. 2020-12-03T07:56:47Z 2020-12-03T07:56:47Z 2019 Journal Article Sethunga, G. S. M. D. P., Karahan, H. E., Wang, R., & Bae, T.-H. (2019). PDMS-coated porous PVDF hollow fiber membranes for efficient recovery of dissolved biomethane from anaerobic effluents. Journal of Membrane Science, 584, 333-342. doi:10.1016/j.memsci.2019.05.016 0376-7388 https://hdl.handle.net/10356/144935 10.1016/j.memsci.2019.05.016 584 333 342 en Journal of Membrane Science © 2019 Elsevier B.V. All rights reserved. This paper was published in Journal of Membrane Science and is made available with permission of Elsevier B.V. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Chemistry
Methane Recovery
Hollow Fiber Membrane
spellingShingle Science::Chemistry
Methane Recovery
Hollow Fiber Membrane
Sethunga, Godakooru Sethunga Mudiyanselage Dilhara Prebhashwari
Karahan, Huseyin Enis
Wang, Rong
Bae, Tae-Hyun
PDMS-coated porous PVDF hollow fiber membranes for efficient recovery of dissolved biomethane from anaerobic effluents
description This report demonstrates the fabrication of a composite hollow fiber membrane that efficiently recovers dissolved methane (dCH4) from anaerobic wastewater treatment effluents via membrane contactor (MC) process. We first fabricated highly porous hollow fiber membranes (∼85% porosity) using polyvinylidene difluoride (PVDF). Then, we coated the whole structure (bulk), or lumen side of PVDF supports with polydimethylsiloxane (PDMS), a hydrophobic polymer possessing high gas permeability. The adjustment of the concentration of PDMS precursor mix could effectively serve for tuning the performance characteristics of MC membranes and helped suppress membrane wetting, a major performance-reducing factor. Despite their denser skin layers, the lumen-modified membranes demonstrated superior dCH4 recovery flux. Mass transfer analyses have confirmed the importance of preserving bulk porosity while coating the membrane surfaces. The long-term performance tests performed using actual anaerobic effluents suggested that the PDMS coating did not accelerate fouling, such that the lumen-modified MC membranes showed an almost steady flux for 8 days with an anaerobic membrane bioreactor effluent. A high-strength effluent, obtained from an up-flow anaerobic sludge blanket reactor, induced faster fouling. However, we observed only a ∼20% flux decline in a 10-day operation. Thus, we propose that the designed PDMS-PVDF composite membranes are promising for industrial practices.
author2 Interdisciplinary Graduate School (IGS)
author_facet Interdisciplinary Graduate School (IGS)
Sethunga, Godakooru Sethunga Mudiyanselage Dilhara Prebhashwari
Karahan, Huseyin Enis
Wang, Rong
Bae, Tae-Hyun
format Article
author Sethunga, Godakooru Sethunga Mudiyanselage Dilhara Prebhashwari
Karahan, Huseyin Enis
Wang, Rong
Bae, Tae-Hyun
author_sort Sethunga, Godakooru Sethunga Mudiyanselage Dilhara Prebhashwari
title PDMS-coated porous PVDF hollow fiber membranes for efficient recovery of dissolved biomethane from anaerobic effluents
title_short PDMS-coated porous PVDF hollow fiber membranes for efficient recovery of dissolved biomethane from anaerobic effluents
title_full PDMS-coated porous PVDF hollow fiber membranes for efficient recovery of dissolved biomethane from anaerobic effluents
title_fullStr PDMS-coated porous PVDF hollow fiber membranes for efficient recovery of dissolved biomethane from anaerobic effluents
title_full_unstemmed PDMS-coated porous PVDF hollow fiber membranes for efficient recovery of dissolved biomethane from anaerobic effluents
title_sort pdms-coated porous pvdf hollow fiber membranes for efficient recovery of dissolved biomethane from anaerobic effluents
publishDate 2020
url https://hdl.handle.net/10356/144935
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