Fouling in membrane bioreactors: An updated review

Meng, Fangang; Zhang, Shaoqing; Oh, Yonghui; Zhou, Zhongbo; Shin, Hang‐Sik; Chae, So-Ryong

doi:10.1016/j.watres.2017.02.006

Cited by 801 publications

(274 citation statements)

References 346 publications

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“…The absorbed hydrophobic substances facilitated the accumulation of hydrophilic LB-EPS of bulk sludge (e.g., polysaccharides) on the conditioned membrane to form a cake layer [16]. Hydrophobicity/ hydrophilicity of SMP and EPS is expected to play an important role in membrane fouling [5], which is governed by complicated physical-chemical interactions between the membrane and initial foulants, followed by foulant-foulant interactions [24].…”

Section: Hydrophobic/hydrophilic Substances Of Eps Fractionsmentioning

confidence: 99%

“…The irreversible fouling quickly becomes severe, caused by abundant biopolymers and humic substances in SMP readily plugging the narrowed pores. Hydrophobic and electrostatic interactions of humic and hydrophilic polysaccharides [24] are considered to keep the foulants in the membrane pores [16; this study]. Consequently, the non-covalent network formed by hydrophilic proteins and polysaccharides can make irreversible foulants more complicated [24,39].…”

Section: Role and Fate Of Eps Components In Mbr Foulingmentioning

confidence: 99%

“…In addition, small flocs, colloids, LB-EPS hydrophobicity and negative charge are vital in cake layer formation and sludge aggregation [23]. SMP and bound EPS also reportedly play important roles in the initial and late fouling stages, respectively [24], in which the initial fouling (conditioning of membrane) was caused by humics, whereas later fouling was mainly caused by polysaccharides [16]. Furthermore, SMP have a MW distribution of lower 200 kDa while EPS of cake layers obtained a larger MW one (488 − 3,397 kDa) [25].…”

Section: Introductionmentioning

confidence: 99%

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Polarity-Molecular Weight Profile of Extracellular Polymeric Substances in a Membrane Bioreactor: Comparison between Bulk Sludge and Cake Layers

Hong

Taing

Phan

et al. 2018

J. of Wat. & Envir. Tech.

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Extracellular polymeric substances (EPS) are reported to be the major foulant in membrane bioreactor (MBR) processes. It is important to understand the EPS fractions which cause irreversible fouling to reduce operation cost and energy consumption in MBR. In this study, we developed polarity-molecular weight profiling, in which EPS components were plotted on two-dimensional matrix of its polarity and molecular weight, and applied it to investigate EPS of bulk sludge and cake layers from a labscale MBR. The EPS components were also characterized via three-dimensional excitation-emission matrix (3D-EEM) spectroscopy. The result showed that hydrophilic substances as large as 100 − 670 kDa was found only in loosely-bound EPS (LB-EPS) of bulk sludge but not in that of cake layers nor in permeate. Hydrophobic substances smaller than 20 kDa were mainly found in soluble microbial products (SMP) in bulk sludge. Hydrophilic substances larger than 670 kDa was mainly found in tightly-bound EPS (TB-EPS) of bulk sludge and in LB-and TB-EPS of cake layers. These findings suggest that, after conditioning of micropores of virgin membrane by hydrophobic substances smaller than 20 kDa in SMP, hydrophilic biopolymers as large as 100 − 670 kDa in bulk sludge clog the narrowed micropores inside membrane, causing irreversible fouling.

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Section: Hydrophobic/hydrophilic Substances Of Eps Fractionsmentioning

confidence: 99%

Section: Role and Fate Of Eps Components In Mbr Foulingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polarity-Molecular Weight Profile of Extracellular Polymeric Substances in a Membrane Bioreactor: Comparison between Bulk Sludge and Cake Layers

Hong

Taing

Phan

et al. 2018

J. of Wat. & Envir. Tech.

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“…As a crucial component of the electro‐membrane bioreactor system (EMBR), inorganic and organic conductive membranes have been studied for membrane fouling mitigation during filtration as membrane cathode. They include the stainless steel membrane, nickel metal hollow fiber membrane, graphene modified organic membrane, multi‐walled carbon nanotubes/carbon nanotubes modified organic membrane and conducting polymer modified organic membrane .…”

Section: Introductionmentioning

confidence: 99%

Polypyrrole vapor phase polymerization on PVDF membrane surface for conductive membrane preparation and fouling mitigation

Liu

Tian

Xiong

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND Conductive membranes, such as carbon material modified membrane and nickel metal film could be used for membrane fouling mitigation and energy generation during filtration. However, it is necessary to simplify the preparation process and reduce the cost for practical application. Here, a conducting polymer polypyrrole was polymerized on PVDF membrane surface for conductive membrane preparation via vapor phase polymerization. RESULTS After modification, the pure water flux was reduced from 3393.26 ± 222.99 L m‐2 h‐1 to 569.48 ± 150.82 L m‐2 h‐1. The contact angle was 58.63° for blank membrane after 8 s of delay, which was reduced to 27.53° for modified membrane. During short‐term filtration, the modified membrane maintained high, stable flux and low effluent turbidity. The fouling of conductive membrane can be mitigated by 1 V cm‐1 of electric filed during long‐term filtration. Better effluent properties were obtained from modified membrane, which were improved further when an electric field was applied. CONCLUSION It is concluded that the conductive membrane has a smoother and more hydrophilic surface, resulting in better anti‐fouling and effluent properties with the assistance of an electric field. © 2017 Society of Chemical Industry

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“…Thus it can lead to occur the fouling phenomena. During the process of membrane filtration, both forms of these substances are accumulated on the membrane surface [5][6][7][8]. The use of membrane technology is associated with preventing its pollution.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pac on MBR Performance During the Treatment of Synthetic Wastewater Containing Organic Compounds

Skorek‐Osikowska

Uchman

Werle

2017

Architecture, Civil Engineering, Environment

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A b s t r a c tThe aim of this study was to determine the effect of powdered activated carbon on fouling intensity of capillary membranes working in the submerged membrane bioreactor during the treatment of synthetic municipal wastewater loaded with organic compounds. The research were carried out in a membrane bioreactor including a capillary ultrafiltration module made of polyethersulfone. The feed used in the presented study was synthetic municipal wastewater which was prepared in order to include high organic content. Moreover, the volumetric flux of the treated wastewater and the percentage of reversible and irreversible fouling were determined. It was found that activated carbon addition to a membrane bioreactor (MBR) treating wastewater reduced irreversible fouling. The volumetric flux of the treated wastewater for PAC-assisted MBRs was higher by approximately 40% as compared to the volumetric flux of the treated wastewater without any sorbents. S t r e s z c z e n i e Celem niniejszej pracy było określenie wpływu dodatku sproszkowanego węgla aktywnego na intensywność zjawiska foulingu membran kapilarnych zanurzonych w bioreaktorze membranowym podczas oczyszczania syntetycznych ścieków komunalnych obciążonych związkami organicznymi. Badania prowadzono w bioreaktorze membranowym z zanurzonym ultrafiltracyjnym modułem kapilarnym wykonanym z polieterosulfonu. Substratem badań były syntetyczne ścieki komunalne, preparowane tak aby charakteryzowały się wysoką zawartością związków organicznych. W trakcie prowadzenia badań wyznaczano objętościowy strumień ścieków oczyszczonych oraz procentowy udział foulingu całkowitego, który jest sumą foulingu odwracalnego i nieodwracalnego. Wykazano, że dodatek węgla aktywnego do bioreaktora membranowego zmniejszył intensywność nieodwracalnego zjawiska blokowania membran. Objętościowy strumień ścieków oczyszczonych w obecności PAC były wyższy w porównaniu do strumienia ścieków oczyszczonych bez dodatku sorbentu średnio 40%.

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Fouling in membrane bioreactors: An updated review

Cited by 801 publications

References 346 publications

Polarity-Molecular Weight Profile of Extracellular Polymeric Substances in a Membrane Bioreactor: Comparison between Bulk Sludge and Cake Layers

Polarity-Molecular Weight Profile of Extracellular Polymeric Substances in a Membrane Bioreactor: Comparison between Bulk Sludge and Cake Layers

Polypyrrole vapor phase polymerization on PVDF membrane surface for conductive membrane preparation and fouling mitigation

Effect of Pac on MBR Performance During the Treatment of Synthetic Wastewater Containing Organic Compounds

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