Identification of activated sludge properties affecting membrane fouling in submerged membrane bioreactors

2006 ◽  
Vol 51 (1) ◽  
pp. 95-103 ◽  
Author(s):  
Fangang Meng ◽  
Hanmin Zhang ◽  
Fenglin Yang ◽  
Shoutong Zhang ◽  
Yansong Li ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Membrane Fouling ◽  
Membrane Bioreactors ◽  
Sludge Properties

Effect of activated sludge properties and membrane operation conditions on fouling characteristics in membrane bioreactors

Chemosphere ◽  
2006 ◽  
Vol 63 (10) ◽  
pp. 1699-1708 ◽  
Author(s):  
Hyeok Choi ◽  
Kai Zhang ◽  
Dionysios D. Dionysiou ◽  
Daniel B. Oerther ◽  
George A. Sorial
Keyword(s):  
Activated Sludge ◽  
Membrane Bioreactors ◽  
Operation Conditions ◽  
Sludge Properties ◽  
Fouling Characteristics

The importance of measuring the sludge filterability at an MBR – introduction of a new method

2012 ◽  
Vol 66 (1) ◽  
pp. 9-14 ◽  
Author(s):  
C. Thiemig
Keyword(s):  
Membrane Fouling ◽  
Reliable Method ◽  
Membrane Bioreactors ◽  
New Method ◽  
Strong Impact ◽  
Laboratory Equipment ◽  
Filtration Performance ◽  
Sludge Properties ◽  
Operational Aspects ◽  
General Method

Sludge properties have a strong impact on the operational aspects of membrane bioreactors (MBRs). Poor sludge properties cause stronger membrane fouling and reduce the filtration performance of MBRs. Up to now there is no general method used to measure the fouling or filtration relevant sludge properties in MBRs. The aim of this work was to develop a simple but reliable method to supply operators a tool to monitor the important sludge properties for their application and to compare this method with existing techniques. Through extensive research a new method called the sludge filtration index (SFI) has been developed to indicate the appropriate sludge parameters for MBR systems in a cheap and easy manner. The SFI can be measured with simple laboratory equipment and offers operators a powerful tool to monitor the conditions of their sludge, independent of the membrane conditions.

scholarly journals Long-Term Investigation into the Membrane Fouling Behavior in Anaerobic Membrane Bioreactors for Municipal Wastewater Treatment Operated at Two Different Temperatures

Membranes ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 231
Author(s):  
Yi Ding ◽  
Zhansheng Guo ◽  
Zhenlin Liang ◽  
Xuguang Hou ◽  
Zhipeng Li ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Membrane Fouling ◽  
Municipal Wastewater ◽  
Membrane Bioreactors ◽  
Municipal Wastewater Treatment ◽  
Sludge Flocs ◽  
Microbial Product ◽  
Anaerobic Membrane Bioreactors ◽  
Sludge Particle

In this study, the characteristics of activated sludge flocs were investigated and their effects on the evolution of membrane fouling were considered in the anaerobic membrane bioreactors (AnMBR), which were operated at 25 and 35 °C for municipal wastewater treatment. It was found that the membrane fouling rate of the AnMBR at 25 °C was more severe than that at 35 °C. The membrane fouling trends were not consistent with the change in the concentration of soluble microbial product (SMP). The larger amount of SMP in the AnMBR at 35 °C did not induce more severe membrane fouling than that in the AnMBR at 25 °C. However, the polysaccharide and protein concentration of extracellular polymeric substance (EPS) was higher in the AnMBR at 25 °C in comparison with that in the AnMBR at 35 °C, and the protein/polysaccharide ratio of the EPS in the AnMBR at 25 °C was higher in contrast to that in the AnMBR at 35 °C. Meanwhile, the fouling tendencies measured for the AnMBRs could be related to the characteristics of loosely bound EPS and tightly bound EPS. The analysis of the activated sludge flocs characteristics indicated that a smaller sludge particle size and more fine flocs were observed at the AnMBR with 25 °C. Therefore, the membrane fouling potential in the AnMBR could be explained by the characteristics of activated sludge flocs.

Study on Activated Sludge Properties of A/A/O Combined Membrane Bioreactor during Startup Period

2011 ◽  
Vol 374-377 ◽  
pp. 836-839
Author(s):  
Shuo Liu ◽  
Bao Zhen Wang ◽  
Xu Yang
Keyword(s):  
Activated Sludge ◽  
Membrane Fouling ◽  
Operation Time ◽  
Biological Properties ◽  
Sludge Flocs ◽  
Fouling Control ◽  
Conventional Activated Sludge ◽  
Sludge Properties ◽  
Startup Period ◽  
Sludge Activity

To improve treatment performance and alleviate membrane fouling, the physical and biological properties of sludge in combined MBR which divided into anoxic, anaerobic and aerobic zone were studied. During initial startup period, the sludge in A/A/O combined MBR was suspended growth, after textile carrier package, the sludge was suspended and fixed growth. The biomass analysis showed that with the increase of operation time, MLVSS/MLSS decreased from 0.93 to 0.72 which certified that high MLSS concentration caused biomass growth slow gradually, while packing textile carrier could supply attached biomass which maximum value was 0.18g/cm(3777.8mg/L). Meanwhile, high MLSS concentration also resluted in high sludge viscosity which could reach to 35.42mPa•s and decreased sludge activity. Particle size anaylisis showed that shear stress of aeration made the sludge flocs smaller than conventional activated sludge process. All the sludge properties which had been analysis in this study showed A/A/O combined MBR had great difference from conventional MBR process, and some parameters could be used for membrane fouling control in A/A/O combined MBR for wastewater treatment project.

scholarly journals Effects of a low-strength magnetic field on the characteristics of activated sludge for membrane fouling mitigation

RSC Advances ◽  
2019 ◽  
Vol 9 (16) ◽  
pp. 9180-9186 ◽  
Author(s):  
Ren Zhijun ◽  
Wang Pengfei ◽  
Tian Jiayu ◽  
Zhang Zhiliu
Keyword(s):  
Magnetic Field ◽  
Microbial Community ◽  
Activated Sludge ◽  
Membrane Fouling ◽  
Membrane Bioreactors ◽  
Sludge Characteristics ◽  
Fouling Mitigation ◽  
Low Strength

This study aims to investigate the performance of a low-strength magnetic field in membrane bioreactors (MBRs) for membrane fouling mitigation and its effects on sludge characteristics and microbial community.

Sludge properties and their effects on membrane fouling in submerged anaerobic membrane bioreactors (SAnMBRs)

2009 ◽  
Vol 43 (15) ◽  
pp. 3827-3837 ◽  
Author(s):  
H.J. Lin ◽  
K. Xie ◽  
B. Mahendran ◽  
D.M. Bagley ◽  
K.T. Leung ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactors ◽  
Anaerobic Membrane Bioreactors ◽  
Sludge Properties

scholarly journals Patterned Membrane in an Energy-Efficient Tilted Panel Filtration System for Fouling Control in Activated Sludge Filtration

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 432 ◽  
Author(s):  
Aisyah Osman ◽  
Normi Izati Mat Nawi ◽  
Shafirah Samsuri ◽  
Muhammad Roil Bilad ◽  
Norazanita Shamsuddin ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Membrane Fouling ◽  
Membrane Surface ◽  
Aeration Rate ◽  
Membrane Bioreactors ◽  
Widespread Application ◽  
Membrane Area ◽  
Surface Corrugation ◽  
Fouling Control ◽  
The Impact

A membrane bioreactor enhances the overall biological performance of a conventional activated sludge system for wastewater treatment by producing high-quality effluent suitable for reuse. However, membrane fouling hinders the widespread application of membrane bioreactors by reducing the hydraulic performance, shortening membrane lifespan, and increasing the operational costs for membrane fouling management. This study assesses the combined effect of membrane surface corrugation and a tilted panel in enhancing the impact of air bubbling for membrane fouling control in activated sludge filtration, applicable for membrane bioreactors. The filterability performance of such a system was further tested under variable parameters: Filtration cycle, aeration rate, and intermittent aeration. Results show that a combination of surface corrugation and panel tilting enhances the impact of aeration and leads to 87% permeance increment. The results of the parametric study shows that the highest permeance was achieved under short filtration–relaxation cycle of 5 min, high aeration rate of 1.5 L/min, and short switching period of 2.5 min, to yield the permeances of 465 ± 18, 447 ± 2, and 369 ± 9 L/(m2h bar), respectively. The high permeances lead to higher operational flux that helps to lower the membrane area as well as energy consumption. Initial estimation of the fully aerated system yields the energy input of 0.152 kWh/m3, much lower than data from the full-scale references of <0.4 kWh/m3. Further energy savings and a lower system footprint can still be achieved by applying the two-sided panel with a switching system, which will be addressed in the future.

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