Enhancement effects of cationic contaminants from bacteria on cake layer formation and biofouling on an RO membrane

2017 ◽  
Vol 22 (3) ◽  
pp. 281-286 ◽  
Author(s):  
Shun Yamanouchi ◽  
Eri Nasuno ◽  
Masaki Ohno ◽  
Chigusa Okano ◽  
Ken-ichi Iimura ◽  
...  
Keyword(s):  
Layer Formation ◽  
Cake Layer ◽  
Ro Membrane

Modeling of pore blocking and cake layer formation in membrane filtration for wastewater treatment

Desalination ◽  
2006 ◽  
Vol 189 (1-3) ◽  
pp. 97-109 ◽  
Author(s):  
A. Broeckmann ◽  
J. Busch ◽  
T. Wintgens ◽  
W. Marquardt
Keyword(s):  
Wastewater Treatment ◽  
Membrane Filtration ◽  
Layer Formation ◽  
Pore Blocking ◽  
Cake Layer

Development of a numerical model for cake layer formation on a membrane

Desalination ◽  
2013 ◽  
Vol 309 ◽  
pp. 213-221 ◽  
Author(s):  
JaeHo Shin ◽  
KyungHo Kim ◽  
JuHyeon Kim ◽  
SangHwan Lee
Keyword(s):  
Numerical Model ◽  
Layer Formation ◽  
Cake Layer

Integrating activated sludge floc size information in MBR fouling modeling

2015 ◽  
Vol 71 (7) ◽  
pp. 1073-1080 ◽  
Author(s):  
T. A. Cao ◽  
G. Van De Staey ◽  
I. Y. Smets
Keyword(s):  
Activated Sludge ◽  
Membrane Fouling ◽  
Three Dimensional ◽  
Strong Impact ◽  
Layer Formation ◽  
Floc Size ◽  
Pore Blocking ◽  
Three Dimensional Modeling ◽  
Cake Layer ◽  
Floc Size Distributions

Although studied extensively, modeling fouling phenomena in membrane bioreactors (MBRs) remains challenging. It has been well established that cake layer formation and pore blocking have a strong impact on the filtration performance but how to capture that in comprehensive models is not fully defined yet. Since it has been shown that bioflocculation characteristics of activated sludge have a clear link with (the extent of) membrane fouling, this study integrates activated sludge floc size (i.e., particle size distribution) information in the model for pore blocking and cake layer formation with a focus on constant flux operated MBRs. Based on these floc size distributions, a three-dimensional modeling and visualization of the cake layer is envisaged which can then provide the required input information (e.g., the porosity of the cake layer) for the fouling model. The model is calibrated and validated on the basis of experimental data from Hwang et al. (2012) in ‘Membrane bioreactor: TMP rise and characterization of biocake structure using CLSM-image analysis’ (see J. Membr. Sci. 419–420, 33–41).

Observation of cake layer formation and removal on microporous hollow-fibre membranes

2009 ◽  
Vol 9 (1-3) ◽  
pp. 82-85 ◽  
Author(s):  
S. Buetehorn ◽  
M. Brannock ◽  
P. Le-Clech ◽  
G. Leslie ◽  
D. Volmering ◽  
...  
Keyword(s):  
Hollow Fibre ◽  
Layer Formation ◽  
Cake Layer

Comparison of reverse osmosis membrane fouling characteristics in full-scale leachate treatment systems with chemical coagulation and microfiltration pre-treatments

2014 ◽  
Vol 71 (4) ◽  
pp. 580-587 ◽  
Author(s):  
Weerapong Rukapan ◽  
Benyapa Khananthai ◽  
Thirdpong Srisukphun ◽  
Wilai Chiemchaisri ◽  
Chart Chiemchaisri
Keyword(s):  
Reverse Osmosis ◽  
Membrane Fouling ◽  
Full Scale ◽  
Permeate Flux ◽  
Leachate Treatment ◽  
Chemical Coagulation ◽  
Cake Layer ◽  
Ro Membrane ◽  
Pre Treatment ◽  
Fouling Characteristics

Fouling characteristics of reverse osmosis (RO) membrane with chemical coagulation and microfiltration (MF) pre-treatment were investigated at full-scale leachate treatment systems. In chemical coagulation pre-treatment, solid separation from stabilized leachate was performed by ferric chloride coagulation followed by sand filtration. Meanwhile, MF pre-treatment and the RO system utilized direct filtration using a 0.03 µm membrane without chemical addition. MF pre-treatment yielded better pollutant removals in terms of organics and nitrogen. The study on effect of pre-treatment on RO membrane fouling revealed that accumulated foulant on the RO membrane in MF pre-treatment was significantly lower than that of chemical coagulation. Nevertheless, NaOH cleaning of the fouled RO membrane after chemical coagulation pre-treatment could better recover its permeate flux, thus suggesting that the formation of a loose-structure cake layer by chemical coagulation pre-treatment could allow effective penetration of chemical cleaning and detachment of foulant layer from the membrane surface.

Comparative experimental study on fouling mechanisms in nano-porous membrane: cheese whey ultrafiltration as a case study

2016 ◽  
Vol 74 (12) ◽  
pp. 2737-2750 ◽  
Author(s):  
Mohammad Torkamanzadeh ◽  
Mohsen Jahanshahi ◽  
Majid Peyravi ◽  
Ali Shokuhi Rad
Keyword(s):  
Membrane Fouling ◽  
Porous Membrane ◽  
Quantitative Prediction ◽  
Layer Formation ◽  
Cake Filtration ◽  
Operational Conditions ◽  
Cake Layer ◽  
Classical Models ◽  
Pore Blockage ◽  
Relative Errors

Determination of fouling mechanisms and accurate quantitative prediction of nano-porous membrane behavior are of great interest in membrane processes. This work has focused on a comprehensive comparison of two classical and new fouling models. Different operational conditions were tested to analyze the level of agreement of these models with experimental observation. Whey solutions of 8, 0.8 and 0.5 g/L were ultrafiltered in transmembrane pressures (TMPs) of 300 and 500 KPa through a synthesized polyethersulfone/copolymer blend membrane. Fouling mechanisms and the effect of different combinations of TMPs and protein concentrations were determined and analyzed by fitting the experimental data to different models. Based on the results obtained from classical models, it was found that the predictions of the cake layer formation model were quite acceptable, followed by the intermediate blocking model. The new combined pore blockage-cake filtration model, however, was found to be very successful in predicting the flux decline over time for every operational condition tested, with all relative errors of prediction less than 5%. The latter also showed a good performance in the transition from the pore blockage mechanism to cake layer formation.

Effect of membrane characteristics on the performance of membrane bioreactors for oily wastewater treatment

2011 ◽  
Vol 64 (5) ◽  
pp. 1154-1160 ◽  
Author(s):  
S. Mafirad ◽  
M. R. Mehrnia ◽  
M. H. Sarrafzadeh
Keyword(s):  
Wastewater Treatment ◽  
Pore Size ◽  
Oxygen Demand ◽  
Oily Wastewater ◽  
Layer Formation ◽  
Submerged Membrane Bioreactor ◽  
Working Volume ◽  
Cake Layer ◽  
Oily Wastewater Treatment

Influence of membrane material and pore size on the performance of a submerged membrane bioreactor (sMBR) for oily wastewater treatment was investigated. The sMBR had a working volume of about 19 L with flat sheet modules at the same hydrodynamic conditions. Five types of micro- and ultra-polymeric membranes containing cellulose acetate (CA), cellulose nitrate (CN), polyamide (PA), polyvinylidene difluoride (PVDF) and polyethersulfone (PES) were used and their filtration performance in terms of permeability, permeate quality and fouling intensity were evaluated. Characterization of the membranes was done by performing some analysis such as pore size distribution; contact angle and scanning electronic microscopy (SEM) microphotograph on all membranes. The quality of permeates from each membrane was identified by measuring chemical oxygen demand (COD). The results showed more irreversible fouling intensity for membranes with larger pore size which can be due to more permeation of bioparticles and colloids inside the pores. Membrane characteristics have a major role in the preliminary time of the filtration before cake layer formation so that the PA with the highest hydrophilicity had the lowest permeability decline by fouling in this period. Also, the PVDF and PES membranes had better performance according to better permeate quality in the preliminary time of the filtration related to smaller pore size and also their better fouling resistance and chemical stability properties. However, all membranes resulted in the same permeability and permeate quality after cake layer formation. An overall efficiency of about 95% in COD removal was obtained for oily wastewater treatment by the membranes used in this study.

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