Investigation of the effect of coagulation bath composition on PVDF/CA membrane by evaluating critical flux and antifouling properties in lab‐scale submerged MBR

Ultrafiltration membranes were prepared from blends of poly(vinylidene fluoride) (PVDF)/cellulose acetate (CA) via phase inversion method. The effect of different coagulation bath compositions on the morphology and performance of the blend membrane prepared from casting solution of PVDF/CA with rati...

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Bibliographic Details
Published in:Water and environment journal : WEJ 2018-08, Vol.32 (3), p.366-376
Main Authors: Razzaghi, Mohammad Hossein, Tavakolmoghadam, Maryam, Rekabdar, Fatemeh, Oveisi, Fatemeh
Format: Article
Language:English
Subjects:
Acetates
Acetic acid
Additives
Antifouling substances
Bioreactors
Bovine serum albumin
Cellulose
Cellulose acetate
Coagulation
coagulation bath medium
Composition effects
critical flux
Ethanol
Evaluation
Fluctuations
Fluorides
Flux
Fouling
membrane bioreactor
membrane pore size
Membranes
Morphology
phase inversion method
Polymer blends
Polyvinylidene fluorides
Serum
Serum albumin
Sewage
Sodium chloride
Ultrafiltration
Vinylidene fluoride
Wastewater
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Summary:Ultrafiltration membranes were prepared from blends of poly(vinylidene fluoride) (PVDF)/cellulose acetate (CA) via phase inversion method. The effect of different coagulation bath compositions on the morphology and performance of the blend membrane prepared from casting solution of PVDF/CA with ratio of 80/20 was investigated using sewage wastewater. NaCl and ethanol were used as additives of coagulation bath. Fouling analysis was conducted with Bovine Serum Albumin solution and critical flux evaluation was performed using a lab‐scale membrane bioreactor. In terms of morphological structure, the macrovoids decreased and changed to finger‐like structure. The irreversible fouling reduced and the flux recovery ratio (FRR) of the modified membranes increased remarkably while the reversible fouling caused by deposition of foulants on the surface of the membranes increased. The maximum values of FRR and critical flux of irreversibility were reached by the membrane which was prepared in the coagulation bath containing the highest concentration of NaCl.
ISSN:1747-6585
1747-6593
DOI:10.1111/wej.12334