Effect of Suspended Carriers on Extracellular Polymeric Substances in MBR

2014 ◽  
Vol 955-959 ◽  
pp. 1939-1943
Author(s):  
Chun Hua Zhang ◽  
Xiao Xia Ou ◽  
Feng Jie Zhang
Keyword(s):  
Activated Sludge ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Aeration Rate ◽  
Woven Fabric ◽  
Membrane Model ◽  
Synthetic Wastewater ◽  
Model Surface ◽  
Submerged Membrane Bioreactor

Suspended carriers were added into a submerged membrane bioreactor (SMBR) using polypropylene non-woven fabric (PP NWF) as membrane model to treat synthetic wastewater. The changes of EPSSEPSB and EPS in activated sludge mixing liquid of MBR and in sludge on membrane model surface were researched at different aeration rate. The results showed that adding suspended carriers in MBR can increase the concentration of EPSS and EPSB in activated sludge mixing liquid, but the effect on EPSS and EPSB in the sludge on membrane model surface is related to aeration rate. Adding suspended carriers can increase the concentration of EPSS and EPSB in the sludge on membrane model surface at 0.10m3/h of aeration rate; the concentration of EPSS and EPSB in the sludge with suspended carriers is reduced when aeration rate is increased to 0.25m3/h. The study on the effect of aeration rate on EPS in sludge mixing liquid of MBR and in sludge on membrane model surface showed that an optimized aeration rate exists if suspended carriers are added to control MBR membrane fouling. At the optimized aeration rate, membrane fouling can be mitigated and controled effectively.

Effect of Modified Diatomite Addition on Sludge Properties for Membrane Fouling Alleviation in Submerged Membrane Bioreactor

2011 ◽  
Vol 233-235 ◽  
pp. 680-683
Author(s):  
Shuo Liu ◽  
Yan Ping Liu ◽  
Bao Zhen Wang ◽  
Ji Fu Wang
Keyword(s):  
Molecular Weight ◽  
Particle Size ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Submerged Membrane Bioreactor ◽  
Sludge Properties ◽  
Sludge Particle ◽  
Modified Diatomite

To alleviate the membrane fouling in membrane bioreactor, a kind of modified diatomite was used as anti-fouling agent to examine the effect on sludge properties in submerged membrane bioreactor for synthetic domestic wastewater treatment. Three submerged membrane bioreactor setups were operated under fixed membrane flux 21.9m3/m2·h, meanwhile, modified diatomite was added into each membrane bioreactor with dosage of 0mg/L, 1000mg/L and 2000mg/L respectively. Sludge particle size, extracellular polymeric substances and molecular weight distribution were characterized as the activated sludge properties in this study. The experiment results showed that with the increase of modified diatomite dosage, the number of sludge particle size less than 10μm was declined, however, the number between 10–20μm was increased correspondingly. Total extracellular polymeric substances and big molecular weight substances were decreased remarkably with modified diatomite addition dosage of 1000mg/L. The results indicated that addition of modified diatomite could effect of sludge properties in submerged membrane bioreactor. Therefore, membrane filtration performance could be improved by modified diatomite adding which alleviate membrane fouling directly.

Effect of components in activated sludge liquor on membrane fouling in a submerged membrane bioreactor

2006 ◽  
Vol 18 (5) ◽  
pp. 897-902 ◽  
Author(s):  
Shui-li YU ◽  
Fang-bo ZHAO ◽  
Xiao-hui ZHANG ◽  
Guo-lin JING ◽  
Xiang-hua ZHEN
Keyword(s):  
Activated Sludge ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Submerged Membrane Bioreactor

scholarly journals The investigation of paper mill industry wastewater treatment and activated sludge properties in a submerged membrane bioreactor

2017 ◽  
Vol 76 (7) ◽  
pp. 1715-1725 ◽  
Author(s):  
Hanife Sari Erkan ◽  
Guleda Onkal Engin
Keyword(s):  
Retention Time ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Experimental Studies ◽  
Paper Mill ◽  
Calcium Accumulation ◽  
Submerged Membrane Bioreactor ◽  
Paper Mill Wastewater ◽  
Industry Wastewater

The paper mill industry produces high amounts of wastewater and, for this reason, stringent discharge limits are applied for sustainable reclamation and reuse of paper mill industry wastewater in many countries. Submerged membrane bioreactor (sMBR) systems can create new opportunities to eliminate dissolved substances present in paper mill wastewater including. In this study, a sMBR was operated for the treatment of paper mill industry wastewater at 35 h of hydraulic retention time (HRT) and 40 d of sludge retention time (SRT). The chemical oxygen demand (COD), NH3-N and total phosphorus (TP) removal efficiencies were found to be 98%, 92.99% and 96.36%. The results demonstrated that sMBR was a suitable treatment for the removal of organic matter and nutrients for treating paper mill wastewater except for the problem of calcium accumulation. During the experimental studies, it was noted that the inorganic fraction of the sludge increased as a result of calcium accumulation in the reactor and increased membrane fouling was observed on the membrane surface due to the calcification problem encountered. The properties of the sludge, such as extracellular polymeric substances (EPS) and soluble microbial products (SMP), relative hydrophobicity, zeta potential and floc size distribution were also monitored. According to the obtained results, the total EPS was found to be 43.93 mg/gMLSS and the average total SMP rejection by the membrane was determined as 66.2%.

Application of response surface methodology for investigation of membrane fouling behaviours in microalgal membrane bioreactor: the effect of aeration rate and biomass concentration

RSC Advances ◽  
2016 ◽  
Vol 6 (112) ◽  
pp. 111182-111189 ◽  
Author(s):  
Atefeh Alipourzadeh ◽  
Mohammad Reza Mehrnia ◽  
Ahmad Hallaj Sani ◽  
Azadeh Babaei
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Biomass Concentration ◽  
Aeration Rate ◽  
Submerged Membrane Bioreactor

This study was performed to investigate membrane fouling phenomena and to optimize fouling parameters in a submerged membrane bioreactor.

Influence of Extracellular Polymeric Substances on Membrane Fouling and Cleaning in a Submerged Membrane Bioreactor

2005 ◽  
Vol 67 (3) ◽  
pp. 351-356 ◽  
Author(s):  
Chackrit Nuengjamnong ◽  
Ji Hyang Kweon ◽  
Jinwoo Cho ◽  
Kyu-Hong Ahn ◽  
Chongrak Polprasert
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Submerged Membrane Bioreactor

Impact of biological constituents and properties of activated sludge on membrane fouling in a novel submerged membrane bioreactor

Desalination ◽  
2008 ◽  
Vol 225 (1-3) ◽  
pp. 356-365 ◽  
Author(s):  
Jianfeng Li ◽  
Fenglin Yang ◽  
Yaozhong Li ◽  
Fook-Sin Wong ◽  
Hwee Chuan Chua
Keyword(s):  
Activated Sludge ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Submerged Membrane Bioreactor

A venturi device reduces membrane fouling in a submerged membrane bioreactor

2016 ◽  
Vol 74 (1) ◽  
pp. 147-156 ◽  
Author(s):  
Necati Kayaalp ◽  
Gokmen Ozturkmen
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Membrane Surface ◽  
Oxygen Transfer Rate ◽  
Surface Cleaning ◽  
Aeration Rate ◽  
Transmembrane Pressure ◽  
Submerged Membrane Bioreactor ◽  
System A ◽  
Do Concentration

In this study, for the first time, a venturi device was integrated into a submerged membrane bioreactor (MBR) to improve membrane surface cleaning and bioreactor oxygenation. The performances of a blower and the venturi device were compared in terms of membrane fouling and bioreactor oxygenation. Upon comparing membrane fouling, the performances were similar for a low operation flux (18 L/m2.h); however, at a medium flux (32 L/m2.h), the venturi system operated 3.4 times longer than the blower system, and the final transmembrane pressure was one-third that of the blower system. At the highest flux studied (50 L/m2.h), the venturi system operated 5.4 times longer than the blower system. The most notable advantage of using a venturi device was that the dissolved oxygen (DO) concentration of the MBR was in the range of 7 to 8 mg/L at a 3 L/min aeration rate, while the DO concentration of the MBR was inadequate (a maximum of 0.29 mg/L) in the blower system. A clean water oxygenation test at a 3 L/min aeration rate indicated that the standard oxygen transfer rate for the venturi system was 9.5 times higher than that of the blower system.

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