Impact of salt accumulation in the bioreactor on the performance of Nanofiltration Membrane Bioreactor (NF-MBR) + Reverse Osmosis (RO) process for water reclamation

The impacts of salt accumulation, through adjusting the solid retention time (SRT), in the bioreactor on the bioprocess as well as membrane performance of a high retention nanofiltration membrane bioreactor (NF-MBR) and subsequent reverse osmosis (RO) process for water reclamation are addressed in t...

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Main Authors: Tay, Ming Feng, Lee, Seonki, Xu, Huijuan, Jeong, Kwanho, Liu, Chang, Cornelissen, Emile R., Wu, Bing, Chong, Tzyy Haur
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/144152
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1441522022-08-27T20:11:41Z Impact of salt accumulation in the bioreactor on the performance of Nanofiltration Membrane Bioreactor (NF-MBR) + Reverse Osmosis (RO) process for water reclamation Tay, Ming Feng Lee, Seonki Xu, Huijuan Jeong, Kwanho Liu, Chang Cornelissen, Emile R. Wu, Bing Chong, Tzyy Haur School of Civil and Environmental Engineering Singapore Membrane Technology Centre Nanyang Environment and Water Research Institute Engineering Membrane Fouling Nanofiltration The impacts of salt accumulation, through adjusting the solid retention time (SRT), in the bioreactor on the bioprocess as well as membrane performance of a high retention nanofiltration membrane bioreactor (NF-MBR) and subsequent reverse osmosis (RO) process for water reclamation are addressed in this study. The build-up of salts (i.e., Ca, Mg, PO4) is a function of SRT, hydraulic retention time (HRT) and membrane rejection. Despite the accumulation of salts, both NF-MBRs at SRT of 30 and 60 days, achieved (i) similar biodegradation efficiency; (ii) excellent organic removal (> 97%); and (iii) excellent ammonia removal (> 98%). Extending the SRT could improve the microbial bio-flocculation capability, but did not influence the microbial activity, viability, and community structure. However, more severe membrane fouling was observed in the NF-MBR with elevated salt levels, which was attributed to the greater formation of calcium phosphate scale and Ca-polysaccharides complex (i.e., irreversible fouling layer) as well as the cake-enhanced-osmotic-pressure (CEOP) effect. Although both NF-MBRs produced comparable quality of permeate, a higher RO membrane fouling rate was observed when the permeate of NF-MBR with SRT at 60 days was fed to the RO system, implying organic compositions in NF-MBR permeate may influence RO performance. National Research Foundation (NRF) Submitted/Accepted version This research grant is supported by the Singapore National Research Foundation under its Urban Solution & Sustainability Programme and administered by PUB, Singapore’s National Water Agency. The funding support from the Economic Development Board (EDB) of Singapore to the Singapore Membrane Technology Centre (SMTC) is also acknowledged. 2020-10-16T05:14:09Z 2020-10-16T05:14:09Z 2020 Journal Article Tay, M. F., Lee, S., Xu, H., Jeong, K., Liu, C., Cornelissen, E. R., ... Chong, T. H. (2020). Impact of salt accumulation in the bioreactor on the performance of Nanofiltration Membrane Bioreactor (NF-MBR) + Reverse Osmosis (RO) process for water reclamation. Water Research, 170, 115352-. doi:10.1016/j.watres.2019.115352 1879-2448 https://hdl.handle.net/10356/144152 10.1016/j.watres.2019.115352 31812816 170 115352 en Water Research © 2020 Elsevier. All rights reserved. This paper was published in Water Research and is made available with permission of Elsevier. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Membrane Fouling
Nanofiltration
spellingShingle Engineering
Membrane Fouling
Nanofiltration
Tay, Ming Feng
Lee, Seonki
Xu, Huijuan
Jeong, Kwanho
Liu, Chang
Cornelissen, Emile R.
Wu, Bing
Chong, Tzyy Haur
Impact of salt accumulation in the bioreactor on the performance of Nanofiltration Membrane Bioreactor (NF-MBR) + Reverse Osmosis (RO) process for water reclamation
description The impacts of salt accumulation, through adjusting the solid retention time (SRT), in the bioreactor on the bioprocess as well as membrane performance of a high retention nanofiltration membrane bioreactor (NF-MBR) and subsequent reverse osmosis (RO) process for water reclamation are addressed in this study. The build-up of salts (i.e., Ca, Mg, PO4) is a function of SRT, hydraulic retention time (HRT) and membrane rejection. Despite the accumulation of salts, both NF-MBRs at SRT of 30 and 60 days, achieved (i) similar biodegradation efficiency; (ii) excellent organic removal (> 97%); and (iii) excellent ammonia removal (> 98%). Extending the SRT could improve the microbial bio-flocculation capability, but did not influence the microbial activity, viability, and community structure. However, more severe membrane fouling was observed in the NF-MBR with elevated salt levels, which was attributed to the greater formation of calcium phosphate scale and Ca-polysaccharides complex (i.e., irreversible fouling layer) as well as the cake-enhanced-osmotic-pressure (CEOP) effect. Although both NF-MBRs produced comparable quality of permeate, a higher RO membrane fouling rate was observed when the permeate of NF-MBR with SRT at 60 days was fed to the RO system, implying organic compositions in NF-MBR permeate may influence RO performance.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Tay, Ming Feng
Lee, Seonki
Xu, Huijuan
Jeong, Kwanho
Liu, Chang
Cornelissen, Emile R.
Wu, Bing
Chong, Tzyy Haur
format Article
author Tay, Ming Feng
Lee, Seonki
Xu, Huijuan
Jeong, Kwanho
Liu, Chang
Cornelissen, Emile R.
Wu, Bing
Chong, Tzyy Haur
author_sort Tay, Ming Feng
title Impact of salt accumulation in the bioreactor on the performance of Nanofiltration Membrane Bioreactor (NF-MBR) + Reverse Osmosis (RO) process for water reclamation
title_short Impact of salt accumulation in the bioreactor on the performance of Nanofiltration Membrane Bioreactor (NF-MBR) + Reverse Osmosis (RO) process for water reclamation
title_full Impact of salt accumulation in the bioreactor on the performance of Nanofiltration Membrane Bioreactor (NF-MBR) + Reverse Osmosis (RO) process for water reclamation
title_fullStr Impact of salt accumulation in the bioreactor on the performance of Nanofiltration Membrane Bioreactor (NF-MBR) + Reverse Osmosis (RO) process for water reclamation
title_full_unstemmed Impact of salt accumulation in the bioreactor on the performance of Nanofiltration Membrane Bioreactor (NF-MBR) + Reverse Osmosis (RO) process for water reclamation
title_sort impact of salt accumulation in the bioreactor on the performance of nanofiltration membrane bioreactor (nf-mbr) + reverse osmosis (ro) process for water reclamation
publishDate 2020
url https://hdl.handle.net/10356/144152
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