Study on the Membrane Flux of Membrane Reactor and Fouling Control of PVA Membrane

2011 ◽  
Vol 356-360 ◽  
pp. 133-137
Author(s):  
Yan Yan Liu ◽  
Wen Long Zhang
Keyword(s):  
Membrane Fouling ◽  
Membrane Reactor ◽  
Membrane Bioreactor ◽  
Removal Rate ◽  
Fouling Control ◽  
Membrane Flux ◽  
Long Time ◽  
New Type ◽  
Cod Removal Rate ◽  
Main Factor

Membrane is the key that restrict Membrane Bioreactor technology be extensive applied, the membrane flux is an important factor to measure membrane, membrane fouling is the main factor which result in the membrane flux low, the membrane fouling research on a new type of hydrophilic PVA membrane .The experiment results show that the membrane flux is high with the use of PVA membrane. The COD removal rate can reach 90% on average, with long time running, the flux has declined. The flux can be maintained at 168 L/m2.h on the conditions that low-flux, intermittent effluent, backwashing, intermittent aeration, change of aeration intensity and physical cleaning. The membrane bioreactor using PVA membrane was efficient and stable in operation.

scholarly journals A Study on Membrane Fouling Control by Immobilized Microbial Media for Nitrification in Membrane Bioreactor

2019 ◽  
Vol 41 (5) ◽  
pp. 272-277 ◽  
Author(s):  
Ji Sook Kim ◽  
Young Long Kuk ◽  
Jung Yeon Park ◽  
You Jung Jang ◽  
Chul hwi Park
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Fouling Control

scholarly journals Effect of applied voltage on membrane fouling in the amplifying anaerobic electrochemical membrane bioreactor for long-term operation

RSC Advances ◽  
2021 ◽  
Vol 11 (50) ◽  
pp. 31364-31372
Author(s):  
Mengjing Cao ◽  
Yongxiang Zhang ◽  
Yan Zhang
Keyword(s):  
Chemical Oxygen Demand ◽  
Applied Voltage ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Glucose Solution ◽  
Oxygen Demand ◽  
Term Operation ◽  
Long Time

A novel and amplifying anaerobic electrochemical membrane bioreactor was constructed and operated for a long time (204 days) with synthetic glucose solution having an average chemical oxygen demand (COD) of 315 mg L−1, at different applied voltages and room temperatures.

scholarly journals Alleviation of Ultrafiltration Membrane Fouling by ClO2 Pre-Oxidation: Fouling Mechanism and Interface Characteristics

Membranes ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 78
Author(s):  
Bin Liu ◽  
Meng Wang ◽  
Kaihan Yang ◽  
Guangchao Li ◽  
Zhou Shi
Keyword(s):  
Natural Water ◽  
Membrane Fouling ◽  
Interaction Force ◽  
Interfacial Free Energy ◽  
Fouling Control ◽  
Membrane Flux ◽  
Flux Decline ◽  
Interface Characteristics ◽  
Cake Layer ◽  
Free Energy Analysis

In order to alleviate membrane fouling and improve removal efficiency, a series of pretreatment technologies were applied to the ultrafiltration process. In this study, ClO2 was used as a pre-oxidation strategy for the ultrafiltration (UF) process. Humic acid (HA), sodium alginate (SA), and bovine serum albumin (BSA) were used as three typical organic model foulants, and the mixture of the three substances was used as a representation of simulated natural water. The dosages of ClO2 were 0.5, 1, 2, 4, and 8 mg/L, with 90 min pre-oxidation. The results showed that ClO2 pre-oxidation at low doses (1–2 mg/L) could alleviate the membrane flux decline caused by humus, polysaccharides, and simulated natural water, but had a limited alleviating effect on the irreversible resistance of the membrane. The interfacial free energy analysis showed that the interaction force between the membrane and the simulated natural water was also repulsive after the pre-oxidation, indicating that ClO2 pre-oxidation was an effective way to alleviate cake layer fouling by reducing the interaction between the foulant and the membrane. In addition, ClO2 oxidation activated the hidden functional groups in the raw water, resulting in an increase in the fluorescence value of humic analogs, but had a good removal effect on the fluorescence intensity of BSA. Furthermore, the membrane fouling fitting model showed that ClO2, at a low dose (1 mg/L), could change the mechanism of membrane fouling induced by simulated natural water from standard blocking and cake layer blocking to critical blocking. Overall, ClO2 pre-oxidation was an efficient pretreatment strategy for UF membrane fouling alleviation, especially for the fouling control of HA and SA at low dosages.

Exerting ultrasound to control the membrane fouling in filtration of anaerobic activated sludge—mechanism and membrane damage

2008 ◽  
Vol 57 (5) ◽  
pp. 773-779 ◽  
Author(s):  
Xianghua Wen ◽  
Pengzhe Sui ◽  
Xia Huang
Keyword(s):  
Activated Sludge ◽  
Hydroxyl Radicals ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Chemical Interaction ◽  
Membrane Surface ◽  
Membrane Damage ◽  
Operational Conditions ◽  
Fouling Control ◽  
Cake Layer

In this study, ultrasound was applied to control membrane fouling development online in an anaerobic membrane bioreactor (AMBR). Experimental results showed that membrane fouling could be controlled effectively by ultrasound although membrane damage may occur under some operational conditions. Based upon the observation on the damaged membrane surface via SEM, two mechanisms causing membrane damage by exerting ultrasound are inferred as micro particle collide on the membrane surface and chemical interaction between membrane materials and hydroxyl radicals produced by acoustic cavitations. Not only membrane damage but also membrane fouling control and membrane fouling cleaning were resulted from these mechanisms. Properly selecting ultrasonic intensity and working time, and keeping a certain thickness of cake layer on membrane surface could be effective ways to protect membrane against damage.

Equipment Design of the Ship Sewage Treatment

2011 ◽  
Vol 201-203 ◽  
pp. 1486-1491
Author(s):  
Xian Chao Zhang ◽  
Jian Ping Xu
Keyword(s):  
Escherichia Coli ◽  
Membrane Bioreactor ◽  
Simulation Experiment ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Control Technique ◽  
Treatment Technique ◽  
Biological Method ◽  
Emission Standards ◽  
Cod Removal Rate

A set of equipments for ship sewage treatment, which has been designed according to the characteristics of ship sewage with the advanced sewage treatment technique and the modern automatic control technique, makes ship sewage treatment miniaturized and automatized. The device takes biological method, + MBR Membrane Bioreactor, as the main treatment technique. After the reliability of the technique was justified through the simulation experiment, the mechanical structure of the equipment, including the detailed dimensions and relevant accessories, was designed according to the number of people. Besides, through PLC programmable controller the automatic operation and the automatic alarm have been achieved. As the result of the sewage treatment testing of the prototype, COD removal rate was above 92% , BOD5 removal rate above 98%, SS removal rate above 97%, the test value of heat-resistant Escherichia coli zero, totally meeting the IMO emission standards.

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