Effect of hydraulic retention time on performances of gravity-driven membrane (GDM) reactor for seawater pretreatment

This study aims to illustrate the effect of hydraulic retention time (HRT) on reactor performance and biofilm characteristics in the gravity-driven membrane (GDM) reactor pretreating seawater. Three GDM reactors were operated in parallel for ~62 days under HRTs of 22 h, 54 h, and 102 h, respectively...

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Main Authors: Lee, Seonki, Nötzli, Peter Andreas, Burkhardt, Michael, Wu, Bing, Chong, Tzyy Haur
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/169030
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1690302023-06-27T05:31:50Z Effect of hydraulic retention time on performances of gravity-driven membrane (GDM) reactor for seawater pretreatment Lee, Seonki Nötzli, Peter Andreas Burkhardt, Michael Wu, Bing Chong, Tzyy Haur School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre Engineering::Civil engineering Seawater Pretreatment Hydraulic Retention Time This study aims to illustrate the effect of hydraulic retention time (HRT) on reactor performance and biofilm characteristics in the gravity-driven membrane (GDM) reactor pretreating seawater. Three GDM reactors were operated in parallel for ~62 days under HRTs of 22 h, 54 h, and 102 h, respectively. The results indicated that the GDM reactors at HRTs of 22 h and 102 h had relatively higher permeate flux and superior permeate quality (especially assimilable organic carbon, AOC) compared to that at HRT of 54 h. Extending HRT benefited to reduce irreversible fouling, but cake layer fouling was maximized at HRT of 54 h. As different HRTs led to significantly dissimilar microbial community structure and cake layer composition, such higher cake layer resistance at HRT of 54 h was attributed to homogenous nature of the biofilm, which contained greater amount of organics and less abundance of Nematoda (dominant predator). Lastly, as increasing ~5-time of HRT (from 22 h to 102 h) improved ~1.5 of permeate flux, a shorter HRT of 22 h was preferable for the GDM reactor in pretreating seawater with regard to treatment productivity and footprint. National Research Foundation (NRF) Public Utilities Board (PUB) This research is supported by the National Research Foundation, Singapore, and PUB, Singapore's National Water Agency under its RIE2025 Urban Solutions and Sustainability (USS) (Water) Centre of Excellence (CoE) Programme, awarded to Nanyang Environment & Water Research Institute (NEWRI), Nanyang Technological University, Singapore (NTU). 2023-06-27T05:31:49Z 2023-06-27T05:31:49Z 2023 Journal Article Lee, S., Nötzli, P. A., Burkhardt, M., Wu, B. & Chong, T. H. (2023). Effect of hydraulic retention time on performances of gravity-driven membrane (GDM) reactor for seawater pretreatment. Journal of Water Process Engineering, 53, 103599-. https://dx.doi.org/10.1016/j.jwpe.2023.103599 2214-7144 https://hdl.handle.net/10356/169030 10.1016/j.jwpe.2023.103599 2-s2.0-85149275362 53 103599 en Journal of Water Process Engineering © 2023 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Seawater Pretreatment
Hydraulic Retention Time
spellingShingle Engineering::Civil engineering
Seawater Pretreatment
Hydraulic Retention Time
Lee, Seonki
Nötzli, Peter Andreas
Burkhardt, Michael
Wu, Bing
Chong, Tzyy Haur
Effect of hydraulic retention time on performances of gravity-driven membrane (GDM) reactor for seawater pretreatment
description This study aims to illustrate the effect of hydraulic retention time (HRT) on reactor performance and biofilm characteristics in the gravity-driven membrane (GDM) reactor pretreating seawater. Three GDM reactors were operated in parallel for ~62 days under HRTs of 22 h, 54 h, and 102 h, respectively. The results indicated that the GDM reactors at HRTs of 22 h and 102 h had relatively higher permeate flux and superior permeate quality (especially assimilable organic carbon, AOC) compared to that at HRT of 54 h. Extending HRT benefited to reduce irreversible fouling, but cake layer fouling was maximized at HRT of 54 h. As different HRTs led to significantly dissimilar microbial community structure and cake layer composition, such higher cake layer resistance at HRT of 54 h was attributed to homogenous nature of the biofilm, which contained greater amount of organics and less abundance of Nematoda (dominant predator). Lastly, as increasing ~5-time of HRT (from 22 h to 102 h) improved ~1.5 of permeate flux, a shorter HRT of 22 h was preferable for the GDM reactor in pretreating seawater with regard to treatment productivity and footprint.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Lee, Seonki
Nötzli, Peter Andreas
Burkhardt, Michael
Wu, Bing
Chong, Tzyy Haur
format Article
author Lee, Seonki
Nötzli, Peter Andreas
Burkhardt, Michael
Wu, Bing
Chong, Tzyy Haur
author_sort Lee, Seonki
title Effect of hydraulic retention time on performances of gravity-driven membrane (GDM) reactor for seawater pretreatment
title_short Effect of hydraulic retention time on performances of gravity-driven membrane (GDM) reactor for seawater pretreatment
title_full Effect of hydraulic retention time on performances of gravity-driven membrane (GDM) reactor for seawater pretreatment
title_fullStr Effect of hydraulic retention time on performances of gravity-driven membrane (GDM) reactor for seawater pretreatment
title_full_unstemmed Effect of hydraulic retention time on performances of gravity-driven membrane (GDM) reactor for seawater pretreatment
title_sort effect of hydraulic retention time on performances of gravity-driven membrane (gdm) reactor for seawater pretreatment
publishDate 2023
url https://hdl.handle.net/10356/169030
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