Effect of sludge characteristics on membrane fouling in membrane bioreactors

Pan, Jill-Ruhsing; Su, Yu; Huang, Chihpin; Lee, Hsin Chieh

doi:10.1016/j.memsci.2009.11.055

Cited by 100 publications

(32 citation statements)

References 47 publications

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“…As a consequence, both MBRs were fed with limited available substrate, which could cause more cell lysis and cell hydrolysis, thereby releasing EPS and SMP in activated sludge (Yigit et al, 2008). Moreover, the excess growth of filamentous bacteria could produce more SMP, resulting in severe fouling (Pan et al, 2010). Therefore, the CMBR exhibited more serious fouling compared with the SSMBR.…”

Section: Bound Eps and Smp In Activated Sludgementioning

confidence: 99%

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A comparison study on membrane fouling in a sponge-submerged membrane bioreactor and a conventional membrane bioreactor

Deng

Guo

Ngo

et al. 2014

Bioresource Technology

108

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h i g h l i g h t sLess SMP and bound EPS in activated sludge in the SSMBR induced lower R C and R P . Lower biomass growth and sludge viscosity contributed to lower R C in the SSMBR. Larger sludge flocs, higher zeta potential and RH led to lower R T in the SSMBR. Sponge could prevent pore blocking and cake layer formation. Sponge addition could reduce SMP C and EPS C through adsorption and biodegradation. This study compared membrane fouling in a sponge-submerged membrane bioreactor (SSMBR) and a conventional membrane bioreactor (CMBR) based on sludge properties when treating synthetic domestic wastewater. In the CMBR, soluble microbial products (SMP) in activated sludge were a major contributor for initial membrane fouling and presented higher concentration in membrane cake layer. Afterwards, membrane fouling was mainly governed by bound extracellular polymeric substances (EPS) in activated sludge, containing lower proteins but significantly higher polysaccharides. Sponge addition could prevent cake formation on membrane surface and pore blocking inside membrane, thereby alleviating membrane fouling. The SSMBR exhibited not only less growth of the biomass and filamentous bacteria, but also lower cake layer and pore blocking resistance due to lower bound EPS concentrations in activated sludge. Less membrane fouling in SSMBR were also attributed to larger particle size, higher zeta potential and relative hydrophobicity of sludge flocs.

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Section: Bound Eps and Smp In Activated Sludgementioning

confidence: 99%

“…1), which illustrated that the presence of smaller sludge flocs contributed to higher R C and R P in the CMBR. As larger particles could not easily deposit on membrane surface due to higher shear induced diffusion and inertial lift force, SSMBR demonstrated significantly lower membrane fouling propensity (Pan et al, 2010).…”

Section: Daymentioning

confidence: 99%

A comparison study on membrane fouling in a sponge-submerged membrane bioreactor and a conventional membrane bioreactor

Deng

Guo

Ngo

et al. 2014

Bioresource Technology

108

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“…Overall, the improved aggregation ability of sludge flocs in the MBR-G was ascribed to increased EPS concentrations as well as EPS P /EPS C ratio. Hence, although activated sludge presented higher EPS concentrations, the MBR-G exhibited less membrane fouling propensity with lower fouling rate [23,33]. , respectively.…”

Section: Eps and Smp In Mixed Liquormentioning

confidence: 95%

Membrane fouling reduction and improvement of sludge characteristics by bioflocculant addition in submerged membrane bioreactor

Deng

Guo

Ngo

et al. 2015

Separation and Purification Technology

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a b s t r a c tThe effectiveness of a green bioflocculant (Gemfloc Ò ) on enhanced performance of a submerged membrane bioreactor (SMBR) was evaluated in terms of membrane fouling reduction and sludge characterization. Two MBRs were operated parallelly in this study, namely conventional MBR (CMBR) and MBR with Gemfloc Ò addition (MBR-G). Results showed mitigated membrane fouling through Gemfloc Ò addition in terms of cake layer formation and pore blocking. When compared to the CMBR, in spite of more extracellular polymeric substances (EPS) presented in activated sludge, the MBR-G demonstrated less soluble microbial products (SMP), larger sludge flocs, higher zeta potential and greater relative hydrophobicity of sludge flocs, which decreased cake layer resistance and pore blocking resistance. The reduced cake layer resistance in the MBR-G could be also ascribed to less growth of suspended biomass, lower sludge viscosity, as well as less EPS, SMP and biopolymer clusters in the cake layer. In addition, a modified resistance-in-series model was employed by considering SMP and mixed liquor suspended solids. The simulated results implied that the model could predict the influence of sludge characteristics on membrane fouling behavior of the SMBR.

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“…It is well known that the CST is consistent with the sludge dewaterability and filterability. Many researchers (AlHalbouni et al 2008;Pan et al 2010;Wang et al 2006;Wu et al 2007) have proved that a high CST implies a high bound water content and bad filterability of sludge which could possibly lead to serious membrane fouling, and thus it was reasonable to set CST as an indicator of membrane fouling.…”

Section: Flux and Membrane Fouling Of Mbrmentioning

confidence: 99%

Effects of returning NF concentrate on the MBR-NF process treating antibiotic production wastewater

Cheng

Jianxing

et al. 2016

Environ Sci Pollut Res

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The optimization of the nanofiltration (NF) concentrate backflow ratio (R cb ) and the influence of the NF concentrate on the performance of membrane bioreactornanofiltration (MBR-NF) process treating antibiotic production wastewater were investigated on a laboratory scale. The R cb was optimized at 60 % based on the removal rates of chemical oxygen demand (COD) and NH 4 + -N by MBR. Data analyses indicated that salinity brought by NF concentrate is the major driver leading to the decrease of sludge activity, especially at a high R cb . EPS analysis showed that electric conductivity (EC), proteins in soluble microbial products (SMP), and SMP brought by NF concentrate are the dominant factors causing the severe membrane fouling in MBR. Furthermore, undegradable substances including fulvic acid-like and humic acid-like compounds accumulated in NF concentrate showed significant influence on fouling of NF. MBR could well degrade small MW compounds in NF concentrate, which confirmed the enhancement of organic removal efficiency by recycling the NF concentrate to MBR. The MBR-NF process showed a relatively stable performance at the R cb of 60 % (volume reduction factor (VRF) = 5), and the NF permeate could satisfy the water quality standard for fermentation process with a water recovery rate of 90.9 %.

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Effect of sludge characteristics on membrane fouling in membrane bioreactors

Cited by 100 publications

References 47 publications

A comparison study on membrane fouling in a sponge-submerged membrane bioreactor and a conventional membrane bioreactor

A comparison study on membrane fouling in a sponge-submerged membrane bioreactor and a conventional membrane bioreactor

Membrane fouling reduction and improvement of sludge characteristics by bioflocculant addition in submerged membrane bioreactor

Effects of returning NF concentrate on the MBR-NF process treating antibiotic production wastewater

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