نتایج جستجو برای: catalyst fouling

تعداد نتایج: 48100  

Hamed Azami Mahsa Kazemzadeh Mohamad reza Mehrnia, Mohammad hosein Sarrafzadeh Sara Mafirad Seyed Siavash Madaeni

This paper presents the results of an investigation on the effects of concentration of cations on activated sludge properties and membrane fouling in submerge membrane bioreactors. The working volume of the experimental setup was two liters. The cellulose acetate membrane was immersed in the bioreactor. The flocculability, settling properties and fouling propensity of activated sludge was measu...

2008
Elmira Kujundzic Keith Cobry Alan R. Greenberg Mark Hernandez

The modern challenges for membrane separations in a wide range of processes require more sophisticated approaches for the detection and remediation of fouling, i.e., the association of solutes, particulate matter, and colloids on and/or within a membrane. Most commonly, fouling is assessed from inferred measurements of permeation rate and/or permeate quality. The use of acoustic techniques for ...

2016
Martin Jelemenský Martin Klaučo Radoslav Paulen Joost Lauwers Filip Logist Jan Van Impe Miroslav Fikar

This paper deals with the time-optimal operation and parameter estimation problem of a general diafiltration process in the presence of fouling. Fouling stands for one of the dominant problems in the membrane separation processes. The dynamic behavior of the fouled membrane is described by a general fouling model taken from literature. An Extended Kalman filter is proposed for the recursive est...

Journal: :Journal of colloid and interface science 2014
I M Griffiths A Kumar P S Stewart

Membrane fouling during particle filtration occurs through a variety of mechanisms, including internal pore clogging by contaminants, coverage of pore entrances, and deposition on the membrane surface. Each of these fouling mechanisms results in a decline in the observed flow rate over time, and the decrease in filtration efficiency can be characterized by a unique signature formed by plotting ...

Journal: Polyolefins Journal 2017

In this study, neat HDPE and HDPE/PE-g-MA/EVA blend membranes were fabricated via thermally induced phase separation (TIPS) method and their fouling behaviors were examined using filtration of BSA protein. Membranes were characterized using FESEM, AFM, ATR-FTIR analyses and porosity measurement. Fouling behavior of membranes was analyzed using the resistance-in-series (RIS), classic and combine...

2016
Martin Jelemenský Daniela Pakšiová Radoslav Paulen Abderrazak Latifi Miroslav Fikar Dominique Bonvin

In this paper, we deal with the model-based time-optimal operation of a batch diafiltration process in the presence of membrane fouling. Membrane fouling poses one of the major problems in the field of membrane processes. We model the fouling behavior and estimate its parameters using various methods. Least-squares, least-squares with a moving horizon, recursive least-squares methods and the ex...

2009
B. Lew S. Tarre M. Beliavski C. Dosoretz M. Green

The effect of backwash frequency (15, 30 and 60 min) and influent flux (3.75, 7.50 and 11.25 L/h/m) on fouling amelioration in an innovative external side-stream dead-end microfiltration anaerobic membrane bioreactor (AnMBR) for the treatment of domestic wastewater at 25EC was investigated. During 6 months of reactor operation, a constant COD removal of 88% and an accumulation of 350 mg TSS/L/d...

Journal: :Bioresource technology 2014
Lijuan Deng Wenshan Guo Huu Hao Ngo Jian Zhang Shuang Liang Siqing Xia Zhiqiang Zhang Jianxin Li

This study compared membrane fouling in a sponge-submerged membrane bioreactor (SSMBR) and a conventional membrane bioreactor (CMBR) based on sludge properties when treating synthetic domestic wastewater. In the CMBR, soluble microbial products (SMP) in activated sludge were a major contributor for initial membrane fouling and presented higher concentration in membrane cake layer. Afterwards, m...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2017
A I Zouboulis P K Gkotsis D X Zamboulis M G Mitrakas

Membrane fouling is considered to be the most serious drawback in wastewater treatment when using membrane bioreactors (MBRs), leading to membrane permeability decrease and efficiency deterioration. This work aims to develop an integrated methodology for membrane fouling control, using powdered activated carbon (PAC), which will enhance the adsorption of soluble microbial products (SMP) and imp...

2002

trolling marine fouling on ships’ hulls has been considered essential since the earliest days of marine transport. It has been estimated that without any attempt to control fouling, shipping would require 40% more power, equal to about 72 million tonnes of additional fuel per year.1 Therefore, without an effective antifouling system, today’s marine transport industry would undoubtedly grind to ...

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