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

Abstract

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.

Performance evaluation and organic mass balance for treatment of high strength wastewater by anaerobic hybrid membrane bioreactor

“…However, anaerobic membrane reactor are associated with the drawback of membrane fouling, which is governed by different fouling factors such as characteristics of the membrane, operating conditions, biomass characteristics, and other hydrodynamic conditions . Membrane fouling hinders the bioreactor operation by declination in flux, deterioration of membrane life, and enhancement of operation cost . Physical or chemical cleaning methods adopted for cleaning of membrane further increases the operation and maintenance costs .…”

“…13,14 Membrane fouling hinders the bioreactor operation by declination in flux, deterioration of membrane life, and enhancement of operation cost. 15 Physical or chemical cleaning methods adopted for cleaning of membrane further increases the operation and maintenance costs. 6,8,16 Other approaches implemented to control fouling such as gas sparging, hydro circulation, application of activated carbon (powdered and granular) reduces fouling to a greater extent.…”

Facile Fabrication of High Performance Nanofiltration Membranes by Using Molecular Coordination Complexes as Pore-Forming Agents

“…As shown in Figure , it was found that the total fouling ratio ( R t ) and reversible fouling ratio ( R r ) of PVDF are lower than that of t Bu (0.25) -NPM, indicating that t Bu (0.25) -NPM is more severely fouled during the fouling process than PVDF. The different fouling tendency of these membranes can be attributed to the different pore size of them .…”

Separation and Recycling of Concentrated Heavy Metal Wastewater by Tube Membrane Distillation Integrated with Crystallization

“…The obtained membrane flux is one of the most critical characterizations in the MD process [24,25]. It can be calculated using Equation (1), where V * ρ is permeated mass, A is the active membrane area, and t is the operating time.…”