Impact of protein/carbohydrate ratio in the feed wastewater on the membrane fouling in membrane bioreactors

Arabi, Sara; Nakhla, George

doi:10.1016/j.memsci.2008.07.026

Cited by 118 publications

(46 citation statements)

References 36 publications

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“…The hydrophobic adhesion could enhance adsorption ability of bulk sludge at membrane surface. The result was inconsistent with a previous study of Arabi and Nakhla [11], who found that contributions of hydrophobic substances in bulk sludge and of cake layers are similar and affected by wastewater property. RH proteins in SMP, LB-, and TB-EPS accounted for 50, 24, and 37% in total, respectively (Fig.…”

Section: Relatively Hydrophobic Proteins and Polysaccharidescontrasting

confidence: 99%

“…This finding was consistent with finding of Massé [29] in which proteins are reported to possess higher affinity to sludge flocs than hydrophobic polysaccharides. The hydrophobic substances of SMP (mainly proteins, less polysaccharides) could contribute to pore clogging in this case since a high concentration of hydrophobic substances in SMP reportedly contributes to higher fouling rate due to its higher potential for blocking membrane pores [11]. In addition because Liao [30] found that LB-EPS with more hydrophobicity and less negative charge could own low bio-flocculation, causing more release of SMP from EPS matrix.…”

Section: Relatively Hydrophobic Proteins and Polysaccharidesmentioning

confidence: 91%

“…Relative hydrophobicity of protein and polysaccharide in SMP and EPS were conducted based on the study of Arabi and Nakhla [11]. The procedure is as follows: a 20-mL sample was agitated for 20 min, with 20 mL n-hexane.…”

Section: Relative Hydrophobicitymentioning

confidence: 99%

“…in their components. Relative hydrophobicity in EPS is also expressed as the percentage of the reduction in aqueous phase concentration after extraction in n-hexane [11]. Surface hydrophilicity/hydrophobicity are assessed using the free energy of interaction (ΔG sws ) between two identical surfaces immersed in water [5].…”

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: Relatively Hydrophobic Proteins and Polysaccharidescontrasting

confidence: 99%

Section: Relatively Hydrophobic Proteins and Polysaccharidesmentioning

confidence: 91%

Section: Relative Hydrophobicitymentioning

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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“…Based on these technical definitions of SMP and EPS, much of the existing research has focused on quantification of SMP and EPS components (e.g. proteins, polysaccharides, nucleic acids and so on) and abundance ratios between those individual components in their soluble phase [13][14][15][16][17]. Along with the organic matter from influent wastewater, these non-settleable organic components are one of the primary culprits inhibiting MBR performance based on their role as biofoulants [15,18,19].…”

Section: Introductionmentioning

confidence: 99%

Characterization of biofoulants illustrates different membrane fouling mechanisms for aerobic and anaerobic membrane bioreactors

Xiong

Harb

Hong

2016

Separation and Purification Technology

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Please cite this article as: Y. Xiong, M. Harb, P-Y. Hong, Characterization of biofoulants illustrates different membrane fouling mechanisms for aerobic and anaerobic membrane bioreactors, Separation and Purification Technology (2015), doi: http://dx.doi.org/10.1016/j.seppur. 2015.11.024 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThis study compares the membrane fouling mechanisms of aerobic (AeMBR) and anaerobic membrane bioreactors (AnMBR) of the same reactor configuration at similar operating conditions. Although both the AeMBR and AnMBR achieved more than 90% COD removal efficiency, the fouling mechanisms were different. Molecular weight (MW) fingerprint profiles showed that a majority of fragments in anaerobic soluble microbial products (SMP) were retained by the membrane and some AnMBR systems and can be applied to facilitate the development of appropriate fouling control strategies.

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Correlation of Filtration Resistance with Microbial Polymeric Substances Extracted from Membranes in a Submerged Membrane Bioreactor

Kayaalp

Kinaci

Dizge

et al. 2014

CLEAN Soil Air Water

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The current understanding of membrane fouling in submerged membrane bioreactors is still insufficient. Therefore, the role of microbial polymeric substances in membrane fouling mechanisms in a submerged membrane bioreactor was systematically investigated in this study. Microbial polymeric foulants accumulated on the membrane surface and in its pores. The foulants were then extracted in three steps, without deforming the membrane structure. Moreover, filtration resistances were determined by the resistance in series model. A strong functional relationship was observed between total polymeric substances accumulated in the membrane and their fouling resistances. The greatest accumulation of polymeric substances occurred in cake layers formed on the membrane surface. Correspondingly, the greatest fouling resistance resulted from the cake layer. The results indicated that more protein accumulated on the membrane surface than carbohydrates because the proteins were stickier. Regarding the analysis of microbial polymeric substances, it was observed that the filtration with a 0.45 mm pore size filter did not capture all of the polymeric substances that took part in membrane fouling.

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Impact of protein/carbohydrate ratio in the feed wastewater on the membrane fouling in membrane bioreactors

Cited by 118 publications

References 36 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

Characterization of biofoulants illustrates different membrane fouling mechanisms for aerobic and anaerobic membrane bioreactors

Correlation of Filtration Resistance with Microbial Polymeric Substances Extracted from Membranes in a Submerged Membrane Bioreactor

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