scholarly journals Computational Thermodynamic Analysis of the Interaction between Coagulants and Monosaccharides as a Tool to Quantify the Fouling Potential Reduction in the Biofilm Membrane Bioreactor

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1275
Author(s):  
Olga Kulesha ◽  
Harsha Ratnaweera
Keyword(s):  
Membrane Fouling ◽  
Quantum Chemical ◽  
Membrane Bioreactor ◽  
Soluble Microbial Products ◽  
Fouling Mitigation ◽  
Organic Complexes ◽  
Stable Species ◽  
Computational Thermodynamic ◽  
Major Bottleneck ◽  
Microbial Products

The membrane bioreactor (MBR) and the biofilm membrane bioreactor (BF-MBR) are among key solutions to water scarcity; however, membrane fouling is the major bottleneck for any expansion of these technologies. Prepolymerized aluminum coagulants tend to exhibit the greatest extent of fouling alleviation, with the reduction of soluble microbial products (SMPs) being among the governing mechanisms, which, nevertheless, has been poorly understood. This current study demonstrates that the investigation of the chemical coordination of monosaccharides, which are the major foulants in MBR and BF-MBR, to the main hydrolysis species of the prepolymerized aluminum coagulant, is among the key approaches to the comprehension of the fouling mitigation mechanisms in BF-MBR. Quantum chemical and thermodynamic calculations, together with the multivariate chemometric analysis, allowed the team to determine the principal mechanisms of the SMPs removal, understand the thermodynamic patterns of fouling mitigation, develop the model for the prediction of the fouling mitigation based on the thermodynamic stability of the inorganic-organic complexes, and classify these complexes into thermodynamically stable and less stable species. The results of the study are practically significant for the development of plant surveillance and automated process control with regard to MBR and BF-MBR systems.

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.

A Short Review of the Effect of Temperature on Soluble Microbial Products in the Membrane Bioreactor Systems

2013 ◽  
Vol 864-867 ◽  
pp. 1482-1485 ◽  
Author(s):  
De Qin Ran ◽  
Lin Guo Lu
Keyword(s):  
Membrane Fouling ◽  
Industrial Wastewater ◽  
Membrane Bioreactor ◽  
Short Review ◽  
Effect Of Temperature ◽  
Soluble Microbial Products ◽  
Future Trends ◽  
The Future ◽  
Microbial Products

The membrane bioreactor (MBR) systems have been actively employed for municipal and industrial wastewater treatments. However, membrane fouling is one of the main obstacles that restrict MBR to wide application while soluble microbial products (SMP) are known as major foulants. The paper reviewed the effect of temperature on SMP in MBR systems. At the end, the future trends in the effect of temperature in the coming years were addressed. It will be conducive to further application of MBR in the future.

Modification of ASM No.1 for a submerged membrane bioreactor system: including the effects of soluble microbial products on membrane fouling

2003 ◽  
Vol 47 (12) ◽  
pp. 177-181 ◽  
Author(s):  
J. Cho ◽  
K.-H. Ahn ◽  
Y. Seo ◽  
Y. Lee
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Membrane Resistance ◽  
Soluble Microbial Products ◽  
Submerged Membrane Bioreactor ◽  
Operation Conditions ◽  
In Series ◽  
Bioreactor System ◽  
Microbial Products ◽  
Major Factors

In this study, a mathematical model for the submerged membrane bioreactor (SMBR) was developed by combining the activated sludge model (ASM) with a membrane resistance-in-series model. Some modifications were introduced to make ASM to be suitable for describing the characteristics of SMBR. A set of the 1st-order differential equations was established for 13 dependent variables relevant to particles and soluble matters. Performing model simulations for various conditions, the time when a membrane would be fouled could be predicted as well as the effluent quality. From simulation results, F/M ratio and SRT can be considered as major factors of the soluble microbial products (SMP) concentration in a reactor and it is clear that SMP can play an important role in membrane fouling and water quality simultaneously. The model would be very helpful in optimizing operation conditions as well as in designing an optimal SMBR system.

Hybrid Treatment System to Remove Micromolecular SMPs from Fruit Wastewater Treated with an MBR

2021 ◽  
Author(s):  
Abu Taher Jamal Uddin ◽  
Peter R Zytner ◽  
Richard G Zytner
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Treated Wastewater ◽  
Soluble Microbial Products ◽  
Environmental Footprint ◽  
Microbial Activities ◽  
Food Sector ◽  
Enhanced Coagulation ◽  
Ro Membrane ◽  
Microbial Products

Fruit processors want to reduce their environmental footprint by implementing the recycling of treated wastewater. Observations of a membrane bioreactor (MBR) and reverse osmosis (RO) system showed that the RO quickly fouled due to elevated levels of soluble microbial products (SMPs), an inert micromolecular composition in the form of dissolved organic matter (DOM) in the MBR effluent. Bench scale experiments were completed using enhanced coagulation and granular activated carbon sorption. Results showed that enhanced coagulation removed only 20% of the DOM, which was insufficient to protect the RO membrane. However, sorption studies with GAC showed that 98% of the dissolved SMP-DOM could be removed, the fraction of DOM from microbial activities. Results also showed that when enhanced coagulation preceded the sorption stage, GAC column run time could be extended by about 15%. The resulting BMP minimizes RO membrane fouling in the agri-food sector and opens further water recycling opportunities.

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