Impact of Soluble Microbial Products and Extracellular Polymeric Substances on Filtration Resistance in a Membrane Bioreactor

2009 ◽  
Vol 26 (6) ◽  
pp. 1115-1122 ◽  
Author(s):  
Hai-Feng Zhang
Keyword(s):  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Soluble Microbial Products ◽  
Filtration Resistance ◽  
Microbial Products

scholarly journals Biomass Characteristics and Their Effect on Membrane Bioreactor Fouling

Molecules ◽  
2019 ◽  
Vol 24 (16) ◽  
pp. 2867 ◽  
Author(s):  
Petros K. Gkotsis ◽  
Anastasios I. Zouboulis
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Extracellular Polymeric Substances ◽  
Membrane Surface ◽  
Membrane Resistance ◽  
Soluble Microbial Products ◽  
Gelling Properties ◽  
Microbial Products ◽  
Soluble Part

Biomass characteristics are regarded as particularly influential for fouling in Membrane Bio-Reactors (MBRs). They primarily include the Mixed Liquor Suspended Solids (MLSS), the colloids and the Extracellular Polymeric Substances (EPS). Among them, the soluble part of EPS, which is also known as Soluble Microbial Products (SMP), is the most significant foulant, i.e., it is principally responsible for membrane fouling and affects all fundamental fouling indices, such as the Trans-Membrane Pressure (TMP) and the membrane resistance and permeability. Recent research in the field of MBRs, tends to consider the carbohydrate fraction of SMP (SMPc) the most important characteristic for fouling, mainly due to the hydrophilic and gelling properties, which are exhibited by polysaccharides and allow them to be easily attached on the membrane surface. Other wastewater and biomass characteristics, which affect indirectly membrane fouling, include temperature, viscosity, dissolved oxygen (DO), foaming, hydrophobicity and surface charge. The main methods employed for the characterization and assessment of biomass quality, in terms of filterability and fouling potential, can be divided into direct (such as FDT, SFI, TTF100, MFI, DFCM) or indirect (such as CST, TOC, PSA, RH) methods, and they are shortly presented in this review.

Modeling of extracellular polymeric substances and soluble microbial products production in a submerged membrane bioreactor at various SRTs

2006 ◽  
Vol 53 (7) ◽  
pp. 209-216 ◽  
Author(s):  
Y.T. Ahn ◽  
Y.K. Choi ◽  
H.S. Jeong ◽  
S.R. Chae ◽  
H.S. Shin
Keyword(s):  
Activated Sludge ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Model Simulation ◽  
Kinetic Constant ◽  
Soluble Microbial Products ◽  
Membrane Biofouling ◽  
Microbial Products ◽  
Predicted Values ◽  
Set Up

Extracelluar polymeric substances (EPSs) and soluble microbial products (SMPs) produced by microbial cultures involved in membrane biofouling have been widely investigated. A mathematical model of EPS and SMP formation and degradation was established based on the activated sludge model no. 1 (ASM1) and was applied to the membrane bioreactor sludge with different sludge retention times (SRTs). The unified theory that the distinct products from the EPS and SMP overlapped each other was integrated into the ASM1. Two components, five processes and eight parameters were newly added to set up the model. To increase the accuracy of model simulation, microbial kinetic parameters were determined by respirometry method and applied to the model instead of microbial kinetic constant offered in ASM1. From the respirometry result, both of heterotroph and autotroph showed different yield value, growth rate and decay rate from activated sludge. There was no significant effect of SRT on SMP production and the experimental results showed good agreement with the predicted values by the model simulation. With the developed unified EPS and SMP model, EPS and SMP production could be simulated so well that it can be applied for the membrane biofouling control.

scholarly journals The Effect of Salinity on Membrane Fouling Characteristics in an Intermittently Aerated Membrane Bioreactor

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Kang Xie ◽  
Siqing Xia ◽  
Jing Song ◽  
Jixiang Li ◽  
Liping Qiu ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Membrane Filtration ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Ammonia Nitrogen ◽  
Saline Wastewater ◽  
Sludge Characteristics ◽  
Filtration Resistance ◽  
Microbial Products ◽  
Fouling Characteristics

The effect of salinity on the membrane fouling characteristics was investigated in the intermittently aerated membrane bioreactor (IAMBR). Five different salinity loadings were set from 0 to 35 g·L−1(referring to NaCl), respectively. The removal of total organic carbon (TOC) and ammonia-nitrogen (NH4+-N) was gradually decreased with increasing salinity. The variation of membrane filtration resistance, particle size distribution (PSD), extracellular polymeric substances (EPS), soluble microbial products (SMP), and relative hydrophobicity (RH) analysis revealed that salinity has a significant effect on sludge characteristics in IAMBR. The results also indicated that the membrane fouling is often caused by the integration of sludge characteristics in saline wastewater.

Characteristics of soluble microbial products and extracellular polymeric substances in the membrane bioreactor for water reuse

Desalination ◽  
2007 ◽  
Vol 202 (1-3) ◽  
pp. 90-98 ◽  
Author(s):  
Namjung Janga ◽  
Xianghao Ren ◽  
Geontae Kim ◽  
Changhyo Ahn ◽  
Jaeweon Cho ◽  
...  
Keyword(s):  
Water Reuse ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Soluble Microbial Products ◽  
Microbial Products
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