A critical review of extracellular polymeric substances (EPSs) in membrane bioreactors: Characteristics, roles in membrane fouling and control strategies

2014 ◽  
Vol 460 ◽  
pp. 110-125 ◽  
Author(s):  
Hongjun Lin ◽  
Meijia Zhang ◽  
Fangyuan Wang ◽  
Fangang Meng ◽  
Bao-Qiang Liao ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Critical Review ◽  
Extracellular Polymeric Substances ◽  
Control Strategies ◽  
Membrane Bioreactors ◽  
And Control

Foaming mechanisms and control strategies during the anaerobic digestion of organic waste: A critical review

2021 ◽  
pp. 146531
Author(s):  
Pingjin Yang ◽  
Yun Peng ◽  
Hanyue Tan ◽  
Hengyi Liu ◽  
Di Wu ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Critical Review ◽  
Organic Waste ◽  
Control Strategies ◽  
And Control

scholarly journals Correction: Membrane fouling characteristics of membrane bioreactors (MBRs) under salinity shock: extracellular polymeric substances (EPSs) and the optimization of operating parameters

2021 ◽  
Author(s):  
Ling Luo ◽  
Hui Zhong ◽  
Ye Yuan ◽  
Wenwang Zhou ◽  
Changming Zhong
Keyword(s):  
Membrane Fouling ◽  
Extracellular Polymeric Substances ◽  
Membrane Bioreactors ◽  
Operating Parameters ◽  
Salinity Shock ◽  
Fouling Characteristics

Correction for ‘Membrane fouling characteristics of membrane bioreactors (MBRs) under salinity shock: extracellular polymeric substances (EPSs) and the optimization of operating parameters’ by Changming Zhong et al., Environ. Sci.: Water Res. Technol., 2021, DOI: .

Correlation between membrane fouling and soluble/colloidal organic substances in membrane bioreactors for municipal wastewater treatment

2005 ◽  
Vol 51 (6-7) ◽  
pp. 1-8 ◽  
Author(s):  
B. Lesjean ◽  
S. Rosenberger ◽  
C. Laabs ◽  
M. Jekel ◽  
R. Gnirss ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Extracellular Polymeric Substances ◽  
Municipal Wastewater ◽  
Membrane Bioreactors ◽  
Size Exclusion ◽  
Water Phase ◽  
Parallel Operation ◽  
Municipal Wastewater Treatment ◽  
Operational Conditions ◽  
The Difference

Two similar membrane bioreactors of 2 m3 each were operated in parallel over two years under the same operational conditions, fed with the same municipal wastewater. The only process and operational difference between both pilot plants was the position of the denitrification zone (pre-denitrification in pilot 1 and post-denitrification in pilot 2). Despite parallel operation, the two MBRs exhibited different fouling rates and decreases in permeability. These differences could not be accounted for by MLSS concentrations, loading rates, or filtration flux. In a one-year investigation, soluble and colloidal organic material in the activated sludge of both MBR was regularly analysed by spectrophotometric and Size Exclusion Chromatography (SEC) methods. The larger organic molecules present in the sludge water phase (i.e. polysaccharides, proteins and organic colloids) originating from microbial activity (extracellular polymeric substances) were found to impact on the fouling and to explain the difference in membrane performance between the two MBR units. In both pilot plants, a linear relationship could be clearly demonstrated between the fouling rate of the membrane and the concentration of polysaccharides in the sludge water phase during a 5 month operational period at an SRT of 8 days.

scholarly journals Fouling Issues in Membrane Bioreactors (MBRs) for Wastewater Treatment: Major Mechanisms, Prevention and Control Strategies

Processes ◽  
2014 ◽  
Vol 2 (4) ◽  
pp. 795-866 ◽  
Author(s):  
Petros Gkotsis ◽  
Dimitra Banti ◽  
Efrosini Peleka ◽  
Anastasios Zouboulis ◽  
Petros Samaras
Keyword(s):  
Wastewater Treatment ◽  
Prevention And Control ◽  
Control Strategies ◽  
Membrane Bioreactors ◽  
And Control

Membrane fouling and performance evaluation of conventional membrane bioreactor (MBR), moving biofilm MBR and oxic/anoxic MBR

2014 ◽  
Vol 69 (7) ◽  
pp. 1403-1409 ◽  
Author(s):  
Sher Jamal Khan ◽  
Aman Ahmad ◽  
Muhammad Saqib Nawaz ◽  
Nicholas P. Hankins
Keyword(s):  
Membrane Fouling ◽  
Extracellular Polymeric Substances ◽  
Water Flux ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Membrane Bioreactors ◽  
Nitrogen And Phosphorus ◽  
Biofilm Carrier ◽  
Cake Layer ◽  
And Performance

In this study, three laboratory scale submerged membrane bioreactors (MBRs) comprising a conventional MBR (C-MBR), moving bed MBR (MB-MBR) and anoxic-oxic MBR (A/O-MBR) were continuously operated with synthesized domestic wastewater (chemical oxygen demand, COD = 500 mg/L) for 150 days under similar operational and environmental conditions. Kaldnes® plastic media with 20% dry volume was used as a biofilm carrier in the MB-MBR and A/O-MBR. The treatment performance and fouling propensity of the MBRs were evaluated. The effect of cake layer formation in all three MBRs was almost the same. However, pore blocking caused a major difference in the resultant water flux. The A/O-MBR showed the highest total nitrogen and phosphorus (PO4-P) removal efficiencies of 83.2 and 69.7%, respectively. Due to the high removal of nitrogen, fewer protein contents were found in the soluble and bound extracellular polymeric substances (EPS) of the A/O-MBR. Fouling trends of the MBRs showed 12, 14 and 20 days filtration cycles for C-MBR, MB-MBR and A/O-MBR, respectively. A 25% reduction of the soluble EPS and a 37% reduction of the bound EPS concentrations in A/O-MBR compared with C-MBR was a major contributing factor for fouling retardation and the enhanced filtration capacity of the A/O-MBR.

A review of reverse osmosis membrane fouling and control strategies

2017 ◽  
Vol 595 ◽  
pp. 567-583 ◽  
Author(s):  
Shanxue Jiang ◽  
Yuening Li ◽  
Bradley P. Ladewig
Keyword(s):  
Reverse Osmosis ◽  
Membrane Fouling ◽  
Control Strategies ◽  
Reverse Osmosis Membrane ◽  
And Control

Control of membrane fouling in membrane bioreactor process by coagulant addition

2009 ◽  
Vol 59 (7) ◽  
pp. 1255-1262 ◽  
Author(s):  
I. Mishima ◽  
J. Nakajima
Keyword(s):  
Membrane Fouling ◽  
Phosphorus Removal ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Batch Experiments ◽  
Microbial Products ◽  
Removal Efficiencies ◽  
And Control ◽  
Fe Addition ◽  
Bioreactor Process

The control of membrane fouling is an essential issue in membrane bioreactor (MBR) process. It has been recognized that the most important factors that affect membrane fouling are presence of soluble microbial products (SMP) and extracellular polymeric substances (EPS) in a reactor. The objective of this study was to examine the effect of the coagulant addition on the membrane fouling in the MBR process. Accordingly, laboratory scale batch experiments and MBR experiments were conducted using coagulant. In batch experiments, effective SMP removal and control of EPS release were observed by coagulant addition. Fe coagulant was slightly more effective than Al coagulant in the addition of same mole amount. Therefore, Fe was used as coagulant in MBR experiments. In MBR experiments, Fe solutions of 0 mg/L, 2,260 mg/L and 4,520 mg/L were added into the tanks (Run1, Run2 and Run3, respectively) with the flow rate of 200 mL/d. COD removal efficiencies of 97% and phosphorus removal efficiencies of 92% were observed by Fe addition in the MBR experiment. Membrane fouling occurred more often in Run1 than in the other two Runs. Membrane was cleaned 18, 9 and 5 times in Run1, Run2 and Run3, respectively during 40 days runs. This suggested that the membrane fouling was reduced by the coagulant addition. The protein and carbohydrate concentrations of the SMP in the fraction of 1 μm–0.4 μm in Run2 and Run3 were significantly lower than that in Run1 and the particle size of the activated sludge was obviously increased in Run2 and Run3. These results suggested that the coagulant addition is effective to control the membrane fouling.

A Critical Review of Advanced Electric Machines and Control Strategies for Electric Vehicles

2020 ◽  
pp. 1-25
Author(s):  
Chunhua Liu ◽  
K. T. Chau ◽  
Christopher H. T. Lee ◽  
Zaixin Song
Keyword(s):  
Electric Vehicles ◽  
Critical Review ◽  
Control Strategies ◽  
Electric Machines ◽  
And Control

scholarly journals Fouling mechanism and control strategy of inorganic membrane

2020 ◽  
Vol 194 ◽  
pp. 04047
Author(s):  
Peng Li ◽  
Shoubin Zhang ◽  
Ying Lv ◽  
Guoqiang Ma ◽  
Xinyi Zuo
Keyword(s):  
Membrane Fouling ◽  
Control Strategies ◽  
Atomic Layer ◽  
Membrane Technology ◽  
Inorganic Membrane ◽  
Impregnation Method ◽  
Fouling Control ◽  
Layer Deposition ◽  
Treatment Technologies ◽  
And Control

Compared with the traditional treatment technologies, inorganic membrane technology is gradually becoming the mainstream of the treatment of oily and salty wastewater, but membrane fouling has become the bottleneck restricting the development of membrane technology. In order to solve this problem, the mechanism of membrane fouling and the control strategies of membrane fouling are introduced in this paper. The atomic layer deposition technology and the preparation of TiO2 nanowires (NWs) film by impregnation method were mainly introduced, aiming to provide a more reliable industrial research status in the field of membrane fouling control.

scholarly journals Membrane Fouling in Algal Separation Processes: A Review of Influencing Factors and Mechanisms

2021 ◽  
Vol 3 ◽  
Author(s):  
Andres Felipe Novoa ◽  
Johannes S. Vrouwenvelder ◽  
Luca Fortunato
Keyword(s):  
Membrane Fouling ◽  
Control Strategies ◽  
Membrane Surface ◽  
Cost Effective ◽  
Dynamic Responses ◽  
Feed Water ◽  
Operational Conditions ◽  
Term Operation ◽  
Fouling Control ◽  
And Control

The use of algal biotechnologies in the production of biofuels, food, and valuable products has gained momentum in recent years, owing to its distinctive rapid growth and compatibility to be coupled to wastewater treatment in membrane photobioreactors. However, membrane fouling is considered a main drawback that offsets the benefits of algal applications by heavily impacting the operation cost. Several fouling control strategies have been proposed, addressing aspects related to characteristics in the feed water and membranes, operational conditions, and biomass properties. However, the lack of understanding of the mechanisms behind algal biofouling and control challenges the development of cost-effective strategies needed for the long-term operation of membrane photobioreactors. This paper reviews the progress on algal membrane fouling and control strategies. Herein, we summarize information in the composition and characteristics of algal foulants, namely algal organic matter, cells, and transparent exopolymer particles; and review their dynamic responses to modifications in the feedwater, membrane surface, hydrodynamics, and cleaning methods. This review comparatively analyzes (i) efficiency in fouling control or mitigation, (ii) advantages and drawbacks, (iii) technological performance, and (iv) challenges and knowledge gaps. Ultimately, the article provides a primary reference of algal biofouling in membrane-based applications.

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