چكيده به لاتين
One of the effective methods for increasing the hydrophilicity of polymeric membranes and reducing its fouling is the addition of particles into the matrix of polymeric membrane. Among the many particles that is used for the preparation of mixed matrix membranes (MMM), MIL-101, due to its special chemical and physical properties, is of particular importance. In this study, polymeric membranes were prepared by polyethersulfone (PES) polymer and dimethylacetamide (DMAC) with phase inversion method and the effect of MIL-101 particles with different concentrations on the morphological and fouling behavior of MMM was investigated in the membrane bioreactor (MBR). To determine the structural and surface characteristics of membranes, field emission scanning electron microscope (FESEM), energy dispersive X-ray (EDX), atomic force microscopy (AFM), Fourier transform infrared spectrometer (FTIR), contact angle measurement, pure water flux (PWF) and porosity, protein rejection, chemical oxygen demand (COD), and anti-fouling properties were used. The FTIR spectrum of MIL-101 particles showed that hydroxyl hydrophilic functional group was formed on the surface of MIL-101. The presence of this hydrophilic group on the surface of MIL-101 resulted in more hydrophilicity of the MMM. Therefore, the MMM showed higher PWF than the pure PES membrane. The FESEM images displayed that addition of MIL-101 particle led to the formation of larger pores and more orderly structure than the pure membrane. The presence of particles in the membrane structures was confirmed by EDX analysis. The membrane fouling resistances was evaluated by activated sludge filtration. The results showed that the MMM with 0.4 wt% of MIL-101 had the best anti-fouling characteristic, the highest protein rejection ratio (99%), and PWF and the lowest roughness. The optimal membrane was used in the MBR to investigate the effect of different mixed liqour suspended solids (MLSS) concentration of 8000, 10000 and 12000 mg/l on the flux of the membrane. The results showed that with increasing of MLSS concentration, membrane flux was decreased, the viscosity and the fouling were increased.
