Impact of membrane bioreactor operating conditions on fouling behavior of reverse osmosis membranes in MBR-RO processes

Bing Wu; Tamotsu Kitade; Tzyy Haur Chong; Tadahiro Uemura; Anthony G. Fane

doi:10.1016/j.desal.2012.11.020

Impact of membrane bioreactor operating conditions on fouling behavior of reverse osmosis membranes in MBR-RO processes

Bing Wu^*, Tamotsu Kitade, Tzyy Haur Chong, Tadahiro Uemura, Anthony G. Fane

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

This study compares fouling propensities of reverse osmosis (RO) membranes in two parallel MBR-RO systems. Two MBRs were operated at different food to microorganism (F/M) ratios and the permeate was fed to the respective RO membrane. The results show that greater amounts of organic substances in the high F/M (0.50g/gday^-1)-MBR permeate led to higher RO fouling rates (>4.5-fold) compared to the low F/M ratio (0.17g/gday^-1)-MBR permeate. The presence of filters (~5μm) in the RO feed line and recycled RO concentrate line significantly alleviated RO fouling. Chemical analysis of RO foulants indicated that the soluble polysaccharides and transparent exopolymer particles (TEP) accumulated on the RO membranes were strongly associated with RO fouling. However, propagation of bacterial cells on the membranes did not determine RO fouling development. This finding was further confirmed by confocal laser scanning microscopy images. Furthermore, excitation-emission matrix (EEM) fluorescence spectroscopy was used to trace the fate and transport of the potential soluble foulants in the MBR-RO system.

Original language	English
Pages (from-to)	37-45
Number of pages	9
Journal	Desalination
Volume	311
DOIs	https://doi.org/10.1016/j.desal.2012.11.020
Publication status	Published - Feb 5 2013
Externally published	Yes

ASJC Scopus Subject Areas

General Chemistry
General Chemical Engineering
General Materials Science
Water Science and Technology
Mechanical Engineering

Keywords

Adenosine triphosphate
Extracellular polymeric substances
Soluble polysaccharides
Transmembrane pressure
Transparent exopolymer particles

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10.1016/j.desal.2012.11.020

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title = "Impact of membrane bioreactor operating conditions on fouling behavior of reverse osmosis membranes in MBR-RO processes",

abstract = "This study compares fouling propensities of reverse osmosis (RO) membranes in two parallel MBR-RO systems. Two MBRs were operated at different food to microorganism (F/M) ratios and the permeate was fed to the respective RO membrane. The results show that greater amounts of organic substances in the high F/M (0.50g/gday-1)-MBR permeate led to higher RO fouling rates (>4.5-fold) compared to the low F/M ratio (0.17g/gday-1)-MBR permeate. The presence of filters (~5μm) in the RO feed line and recycled RO concentrate line significantly alleviated RO fouling. Chemical analysis of RO foulants indicated that the soluble polysaccharides and transparent exopolymer particles (TEP) accumulated on the RO membranes were strongly associated with RO fouling. However, propagation of bacterial cells on the membranes did not determine RO fouling development. This finding was further confirmed by confocal laser scanning microscopy images. Furthermore, excitation-emission matrix (EEM) fluorescence spectroscopy was used to trace the fate and transport of the potential soluble foulants in the MBR-RO system.",

keywords = "Adenosine triphosphate, Extracellular polymeric substances, Soluble polysaccharides, Transmembrane pressure, Transparent exopolymer particles",

author = "Bing Wu and Tamotsu Kitade and Chong, {Tzyy Haur} and Tadahiro Uemura and Fane, {Anthony G.}",

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AU - Wu, Bing

AU - Kitade, Tamotsu

AU - Chong, Tzyy Haur

AU - Uemura, Tadahiro

AU - Fane, Anthony G.

PY - 2013/2/5

Y1 - 2013/2/5

N2 - This study compares fouling propensities of reverse osmosis (RO) membranes in two parallel MBR-RO systems. Two MBRs were operated at different food to microorganism (F/M) ratios and the permeate was fed to the respective RO membrane. The results show that greater amounts of organic substances in the high F/M (0.50g/gday-1)-MBR permeate led to higher RO fouling rates (>4.5-fold) compared to the low F/M ratio (0.17g/gday-1)-MBR permeate. The presence of filters (~5μm) in the RO feed line and recycled RO concentrate line significantly alleviated RO fouling. Chemical analysis of RO foulants indicated that the soluble polysaccharides and transparent exopolymer particles (TEP) accumulated on the RO membranes were strongly associated with RO fouling. However, propagation of bacterial cells on the membranes did not determine RO fouling development. This finding was further confirmed by confocal laser scanning microscopy images. Furthermore, excitation-emission matrix (EEM) fluorescence spectroscopy was used to trace the fate and transport of the potential soluble foulants in the MBR-RO system.

AB - This study compares fouling propensities of reverse osmosis (RO) membranes in two parallel MBR-RO systems. Two MBRs were operated at different food to microorganism (F/M) ratios and the permeate was fed to the respective RO membrane. The results show that greater amounts of organic substances in the high F/M (0.50g/gday-1)-MBR permeate led to higher RO fouling rates (>4.5-fold) compared to the low F/M ratio (0.17g/gday-1)-MBR permeate. The presence of filters (~5μm) in the RO feed line and recycled RO concentrate line significantly alleviated RO fouling. Chemical analysis of RO foulants indicated that the soluble polysaccharides and transparent exopolymer particles (TEP) accumulated on the RO membranes were strongly associated with RO fouling. However, propagation of bacterial cells on the membranes did not determine RO fouling development. This finding was further confirmed by confocal laser scanning microscopy images. Furthermore, excitation-emission matrix (EEM) fluorescence spectroscopy was used to trace the fate and transport of the potential soluble foulants in the MBR-RO system.

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KW - Extracellular polymeric substances

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KW - Transmembrane pressure

KW - Transparent exopolymer particles

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Impact of membrane bioreactor operating conditions on fouling behavior of reverse osmosis membranes in MBR-RO processes

Abstract

ASJC Scopus Subject Areas

Keywords

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