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1
Fouling mechanism and screening of backwash parameters

Fatma Zohra Slimane,Fatma Ellouze,Nihel Ben Amar 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.2
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 ScienceON
 
 DBpia
This work deals with the membrane fouling mode and the unclogging in seawater ultrafiltration process. The identification of the fouling mechanism by modeling the experimental flux decline was performed using both the classical models of Hermia and the combined models of Bolton. The results show that Bolton models did not bring more precise information than the Hermia’s and the flux decline can be described by one of the four Hermia’s models since the backwash interval is ≤ 60 min. An experimental screening study has been then conducted to choose among 5 parameters (backwash interval, duration, pulses and the flow-rate or injected hypochlorite concentration) those that are the most influential on the fouling and the net water production. It has emerged that fouling is mainly affected by the backwash interval; its prolongation from 30 to 60 min engenders an increase in the reversible fouling and a decrease in the irreversible fouling. This later is also significantly reduced when the hypochlorite concentration increases from 4.5 to 10 ppm. Moreover, the net water production significantly increases with increasing the filtration duration up to 60 min and decreases with decreasing the backwash duration and backwash flow-rate from 10 to 40 s and from 15 to ≥ 20 L.min-1, respectively.
2
A modelling approach to study the fouling of an anaerobic membrane bioreactor for industrial wastewater treatment

Charfi, Amine,Thongmak, Narumol,Benyahia, Boumediene,Aslam, Muhammad,Harmand, Jé,rô,me,Amar, Nihel Ben,Lesage, Geoffroy,Sridang, Porntip,Kim, Jeonghwan,Heran, Marc Elsevier 2017 Bioresource technology Vol.245 No.1
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Abstract An Anaerobic Membrane BioReactors (AnMBR) model is presented in this paper based on the combination of a simple fouling model and the Anaerobic Model 2b (AM2b) to describe biological and membrane dynamic responses in an AnMBR. In order to enhance the model calibration and validation, Trans-Membrane Pressure (TMP), Total Suspended Solid (TSS), COD, Volatile Fatty Acid (VFA) and methane production were measured. The model shows a satisfactory description of the experimental data with R2 ≈0.9 for TMP data and R2 ≈0.99 for biological parameters. This new model is also proposed as a numerical tool to predict the deposit mass composition of suspended solid and Soluble Microbial Products (SMP) on the membrane surface. The effect of SMP deposit on the TMP jump phenomenon is highlighted. This new approach offers interesting perspectives for fouling prediction and the on-line control of an AnMBR process. Highlights <UL> <LI> A model has been proposed to simulate fouling in an anaerobic membrane bioreactor. </LI> <LI> The proposed model is able to simulate the major foulants concentrations in the AnMBR. </LI> <LI> A numerical tool has been developed to determine the deposit cake composition. </LI> <LI> The Transmembrane pressure jump is due to a decrease in cake porosity. </LI> </UL> Graphical abstract [DISPLAY OMISSION]